[issue40170] [C API] Make PyTypeObject structure an opaque structure in the public C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> PyIter_Check() and PySequence_ITEM() macros access directly PyTypeObject members and must be converted to opaque functions: (...)

PyIter_Check() and PySequence_ITEM() are declared as functions in the limited C API, but overriden with macros in the CPython C API.

I suggest to simply remove the macros to always declare them as functions.

See bpo-33738 "PyIndex_Check conflicts with PEP 384" which added the functions.

See also Tools/scripts/pep384_macrocheck.py script.

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