Remove some more unnecessary casts because everything takes PyObject *

Author: rogerbinns

src/connection.c

@@ -6080,7 +6080,7 @@ static PyTypeObject ConnectionType = {
   .tp_dealloc = Connection_dealloc,
   .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
   .tp_doc = Connection_class_DOC,
-  .tp_traverse = (traverseproc)Connection_tp_traverse,
+  .tp_traverse = Connection_tp_traverse,
   .tp_weaklistoffset = offsetof(Connection, weakreflist),
   .tp_methods = Connection_methods,
   .tp_members = Connection_members,

src/cursor.c

@@ -1927,10 +1927,10 @@ static PyTypeObject APSWCursorType = {
   .tp_dealloc = APSWCursor_dealloc,
   .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
   .tp_doc = Cursor_class_DOC,
-  .tp_traverse = (traverseproc)APSWCursor_tp_traverse,
+  .tp_traverse = APSWCursor_tp_traverse,
   .tp_weaklistoffset = offsetof(APSWCursor, weakreflist),
-  .tp_iter = (getiterfunc)APSWCursor_iter,
-  .tp_iternext = (iternextfunc)APSWCursor_next,
+  .tp_iter = APSWCursor_iter,
+  .tp_iternext = APSWCursor_next,
   .tp_methods = APSWCursor_methods,
   .tp_getset = APSWCursor_getset,
   .tp_init = APSWCursor_init,

src/session.c

@@ -2332,7 +2332,7 @@ static PyTypeObject APSWChangesetType = {
 
 static PyTypeObject APSWChangesetIteratorType = {
   PyVarObject_HEAD_INIT(NULL, 0).tp_name = "apsw.ChangesetIterator", .tp_basicsize = sizeof(APSWChangesetIterator),
-  .tp_iternext = (iternextfunc)APSWChangesetIterator_next,           .tp_iter = APSWChangesetIterator_iter,
+  .tp_iternext = APSWChangesetIterator_next,           .tp_iter = APSWChangesetIterator_iter,
   .tp_dealloc = APSWChangesetIterator_dealloc,
 };