faild to build with ESP IDF

[BartolomeyKant]

the error is:

/home/bartolomey/projects/aether-client-cpp/third_party/stdexec/include/stdexec/__detail/__stop_when.hpp:107:27: error: expected identifier before numeric constant
  107 |           template <class _C>
      |                           ^~
/home/bartolomey/projects/aether-client-cpp/third_party/stdexec/include/stdexec/__detail/__stop_when.hpp:107:27: error: expected '>' before numeric constant
In file included from /home/bartolomey/projects/aether-client-cpp/third_party/stdexec/include/stdexec/__detail/__counting_scopes.hpp:28,
                 from /home/bartolomey/projects/aether-client-cpp/third_party/stdexec/include/stdexec/execution.hpp:29,
                 from /home/bartolomey/projects/aether-client-cpp/aether/executors/executors.h:22,
                 from /home/bartolomey/projects/aether-client-cpp/aether/all.h:27,
                 from /home/bartolomey/projects/aether-client-cpp/examples/cloud/cloud_test.cpp:20:
/home/bartolomey/projects/aether-client-cpp/third_party/stdexec/include/stdexec/__detail/__stop_when.hpp:108:29: error: type/value mismatch at argument 2 in template parameter list for 'template<class _Ty, class ... _As> concept stdexec::__std::constructible_from'
  108 |             requires __std::constructible_from<_Fn, _C>
      |                             ^~~~~~~~~~~~~~~~~~~~~~~~~~~

... and so on.

The problem is that _C is defined as macro in ctype.h on that platform.

I found the same issue kokkos/mdspan#187

Also clang-tidy complains on that code with https://clang.llvm.org/extra/clang-tidy/checks/bugprone/reserved-identifier.html. I not sure if that applicable for stdexec as it's reference for standard implementation, but why use _FN _C instead of just FN and C?