[issue40422] Light refactor: create a common _Py_closerange API

[STINNER Victor]

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

Python/fileutils.c might be a better home for such helper function.

You might move _Py_BEGIN_SUPPRESS_IPH / _Py_END_SUPPRESS_IPH macros into _Py_closerange(), even if currently it makes no diffence. (_Py_BEGIN_SUPPRESS_IPH is specific to Windows, os.closerange() uses it, and _posixsubprocess doesn't need it since it's not used on Windows.)

See also the idea of reminding if the kernel supports the syscall or not:
https://github.com/python/cpython/pull/22651#pullrequestreview-506215041

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