[issue33140] shutil.chown should not be defined in Windows

[Steve Dower]

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

I agree that's theoretically how it should go, but we've had enough examples of undocumented/buggy behaviour where the fix was worse than the bug (to the point where we brought back an undocumented C field that was deprecated in 3.0 because removing it in 3.8 broke too many people). 

A couple of versions with a warning on will reduce the surprise. People are (slowly) learning that DeprecationWarnings matter, so I don't think it'll be wasted effort.

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