[issue40422] Light refactor: create a common _Py_closerange API

[Kyle Evans]

Kyle Evans <kevans at FreeBSD.org> added the comment:

Would you like that on a distinct issue, or is it ok to reuse this BPO since it's a location improvement of an API just introduced?

I've got a local branch now that:

1. moves the suppress IPH stuff into _Py_closerange
2. moves the definition into Python/fileutils.c
3. moves the declaration into Include/fileutils h

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