[patch] libcxx src win32

[G M]

Hello Everyone, in particular Reid.

This patch is a subset of a previous patch I sent. You asked to
separate that patch out to make it easier for you to review.

This is the non contentious part of that patch which you described as
"obvious goodness".

I'll resubmit the other patch once this one is approved which will then be
smaller and easier to review without the attached patch being part of it.

It'll also be easier for me to create that next patch without having to
work around this part in my tree.

Thanks
Glen
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