[PATCH] MS Compat: interpose vadefs.h to fix definitions of _crt_va_{start, end, arg} (PR21247)

[Hans Wennborg]

Addressing rnk's comments.

I tried this on a small program with -Wsystem-headers, and it was clean.

http://reviews.llvm.org/D5784

Files:
  lib/Headers/CMakeLists.txt
  lib/Headers/vadefs.h
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