[issue45434] [C API] Clean-up the Python.h header file

[Dong-hee Na]

Change by Dong-hee Na <donghee.na at python.org>:


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nosy: +corona10
nosy_count: 1.0 -> 2.0
pull_requests: +27295
pull_request: https://github.com/python/cpython/pull/29015

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45434>
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