[issue36346] Prepare for removing the legacy Unicode C API

[STINNER Victor]

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

> Oh, why I can not use C99?

PEP 7 requires C99 to build Python, but I think that we can try to keep C89 compatibility for the public header files (Python C API).

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<https://bugs.python.org/issue36346>
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