[patch] [libcxx] msvc cmake

[G M]

Hi Everyone

Attached is a patch for libcxx's cmake file.

I've changed it so we don't set highest level warnings (all) for MSVC
when building projects using cmake and instead leave the default. That's
/W4 on my machine and seems to be ok.

With all warnings on for msvc, we see literally thousands of warnings.
99.99% aren't relevant and just obscure the ones that are.
I think the user can still override things if they want something different
from the command line when using cmake.
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