[issue40423] Optimization: use close_range(2) if available

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Ah, yeah ENOSYS is it.  I had to do this trick in older subprocess versions for something else.  Still visible here in the old 2.7 backport: https://github.com/google/python-subprocess32/blob/main/_posixsubprocess.c#L801

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