[patch] [libcxx] __config cheeky macro redefinition workaround

[G M]

MS's yvals.h defines _NOEXCEPT to be the same thing as libcxx defines it -
except for a slight white space difference.

This result is msvc generates a lot of macro redefinition warnings because
it think's  libcxx is redefining  _NOEXCEPT to something different when it
isn't different other than by a space.

This patch cheekily add's the space to libcxx's definition to make it
identical to MS's, This makes all of the warnings go away..
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