[issue29871] Enable optimized locks on Windows

[Steve Dower]

Steve Dower added the comment:

I updated the PR to be mergeable and let the AppVeyor run work - https://ci.appveyor.com/project/python/cpython/build/3.7.0a0.2452

Unfortunately, there appear to be a number of regressions due to this. I'm not going to have time right now to work through them myself, but if someone else can it would be great to resolve these and get the change in.

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<http://bugs.python.org/issue29871>
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