[issue37705] winerror_to_errno implementation

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

I'm going to merge and backport this all the way to 3.7. Adding a publicly accessible dict for use in Python code should be 3.9 only.

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versions: +Python 3.7, Python 3.8

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<https://bugs.python.org/issue37705>
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