[issue43502] [C-API] Convert obvious unsafe macros to static inline functions

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland <erlend.aasland at innova.no>:


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keywords: +patch
pull_requests: +23637
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24875

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<https://bugs.python.org/issue43502>
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