[issue45490] [meta][C API] Avoid C macro pitfalls and usage of static inline functions

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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pull_requests: +29387
pull_request: https://github.com/python/cpython/pull/31217

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45490>
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