[issue29871] Enable optimized locks on Windows

[Steve Dower]

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

> I assume you meant #35662

Yes indeed. I am apparently massively dyslexic when it comes to copying issue numbers into the bpo comment field :)

Meanwhile, over on #35662, Jeff has a fix for at least one of the regressions.

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versions: +Python 3.8 -Python 3.7

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