[patch] [libcxx] [mingw] to r187593

[G M]

Here's another attempt at restoring the ability for libcxx to compile again
on mingw 64. link errors should remain whatever problem they previously
were or were not.

See r187593 for more details regarding this patch's necessity.

Please advise of suggestions or if you know it breaks anything that wasn't
already broken and how (real error messages please) and I'll see if I can
revise it accordingly. Otherwise I'm keen for it to be applied ASAP as the
mingw build has been broken since the date r187593 was applied.

This patch should also reduce the number of errors when compiling with
Visual Studio though on VS2013 RC. libcxx doesn't yet compile (at least how
I am building) but it is close. I will be submitting more patches to
improve that situation a little shortly.

Thanks
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