[issue33408] Enable AF_UNIX support in Windows

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

Have you upgraded the building SDK that supports AF_UNIX?

And should remove AF_UNIX flag at runtime on systems older than Windows 10 1804, see issue32394.

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nosy: +Ma Lin

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33408>
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