Mirror the changes made to createrepo_c

[dralley]

Update python build infra to scikit-build-core, use a shared VERSION file, update dist-info creation

[kontura]

@dralley Thank you!
Could you rebase?

Also the Python CI builds have failed but I haven't investigated whether it is related yet.

[dralley]

I rebased. I don't think the CI builds would be related, firstly because it's not merged yet, but also it looks like a C compiler warning-treated-as-error type of thing.

  In file included from /opt/_internal/cpython-3.9.25/include/python3.9/Python.h:81,
                   from /project/libcomps/src/python/src/pycomps_macros.h:24,
                   from /project/libcomps/src/python/src/pycomps.c:28:
  /opt/_internal/cpython-3.9.25/include/python3.9/pytime.h:153:60: warning: ‘struct timespec’ declared inside parameter list will not be visible outside of this definition or declaration
    153 | PyAPI_FUNC(int) _PyTime_FromTimespec(_PyTime_t *tp, struct timespec *ts);
        |                                                            ^~~~~~~~
  /opt/_internal/cpython-3.9.25/include/python3.9/pytime.h:158:56: warning: ‘struct timespec’ declared inside parameter list will not be visible outside of this definition or declaration
    158 | PyAPI_FUNC(int) _PyTime_AsTimespec(_PyTime_t t, struct timespec *ts);
        |                                                        ^~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:775:22: error: implicit declaration of function ‘_PyCFunction_CAST’; did you mean ‘PyCFunction_Call’? [-Wimplicit-function-declaration]
    775 |     {"groups_match", _PyCFunction_CAST(PyCOMPS_groups_match), METH_VARARGS | METH_KEYWORDS,
        |                      ^~~~~~~~~~~~~~~~~
        |                      PyCFunction_Call
  /project/libcomps/src/python/src/pycomps.c:775:22: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
  /project/libcomps/src/python/src/pycomps.c:775:22: note: (near initialization for ‘PyCOMPS_methods[0].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:775:22: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:775:22: note: (near initialization for ‘PyCOMPS_methods[0].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:777:26: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    777 |     {"categories_match", _PyCFunction_CAST(PyCOMPS_categories_match), METH_VARARGS | METH_KEYWORDS,
        |                          ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:777:26: note: (near initialization for ‘PyCOMPS_methods[1].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:777:26: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:777:26: note: (near initialization for ‘PyCOMPS_methods[1].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:779:28: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    779 |     {"environments_match", _PyCFunction_CAST(PyCOMPS_envs_match), METH_VARARGS | METH_KEYWORDS,
        |                            ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:779:28: note: (near initialization for ‘PyCOMPS_methods[2].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:779:28: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:779:28: note: (near initialization for ‘PyCOMPS_methods[2].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:781:18: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    781 |     {"validate", _PyCFunction_CAST(PyCOMPS_validate), METH_NOARGS,
        |                  ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:781:18: note: (near initialization for ‘PyCOMPS_methods[3].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:781:18: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:781:18: note: (near initialization for ‘PyCOMPS_methods[3].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:783:21: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    783 |     {"validate_nf", _PyCFunction_CAST(PyCOMPS_validate_nf), METH_NOARGS,
        |                     ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:783:21: note: (near initialization for ‘PyCOMPS_methods[4].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:783:21: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:783:21: note: (near initialization for ‘PyCOMPS_methods[4].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:785:15: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    785 |     {"xml_f", _PyCFunction_CAST(PyCOMPS_toxml_f), METH_VARARGS | METH_KEYWORDS,
        |               ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:785:15: note: (near initialization for ‘PyCOMPS_methods[5].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:785:15: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:785:15: note: (near initialization for ‘PyCOMPS_methods[5].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:787:17: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    787 |     {"xml_str", _PyCFunction_CAST(PyCOMPS_toxml_str), METH_VARARGS | METH_KEYWORDS,
        |                 ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:787:17: note: (near initialization for ‘PyCOMPS_methods[6].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:787:17: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:787:17: note: (near initialization for ‘PyCOMPS_methods[6].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:789:17: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    789 |     {"toxml_f", _PyCFunction_CAST(PyCOMPS_toxml_f), METH_VARARGS | METH_KEYWORDS,
        |                 ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:789:17: note: (near initialization for ‘PyCOMPS_methods[7].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:789:17: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:789:17: note: (near initialization for ‘PyCOMPS_methods[7].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:791:19: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    791 |     {"toxml_str", _PyCFunction_CAST(PyCOMPS_toxml_str), METH_VARARGS | METH_KEYWORDS,
        |                   ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:791:19: note: (near initialization for ‘PyCOMPS_methods[8].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:791:19: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:791:19: note: (near initialization for ‘PyCOMPS_methods[8].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:793:19: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    793 |     {"fromxml_f", _PyCFunction_CAST(PyCOMPS_fromxml_f), METH_VARARGS | METH_KEYWORDS,
        |                   ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:793:19: note: (near initialization for ‘PyCOMPS_methods[9].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:793:19: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:793:19: note: (near initialization for ‘PyCOMPS_methods[9].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:795:21: error: initialization of ‘PyObject * (*)(PyObject *, PyObject *)’ {aka ‘struct _object * (*)(struct _object *, struct _object *)’} from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
    795 |     {"fromxml_str", _PyCFunction_CAST(PyCOMPS_fromxml_str), METH_VARARGS | METH_KEYWORDS,
        |                     ^~~~~~~~~~~~~~~~~
  /project/libcomps/src/python/src/pycomps.c:795:21: note: (near initialization for ‘PyCOMPS_methods[10].ml_meth’)
  /project/libcomps/src/python/src/pycomps.c:795:21: error: initializer element is not constant
  /project/libcomps/src/python/src/pycomps.c:795:21: note: (near initialization for ‘PyCOMPS_methods[10].ml_meth’)