[PATCH] Resubmit "Improve Windows toolchain support for non-standard environments."

[Zachary Turner]

Patch should be based off of current ToT now, I originally ran git revert <the original revert>, and then submitted this on top of that.  I squashed the two now, so this should be based on top of ToT.

http://reviews.llvm.org/D5892

Files:
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/WindowsToolChain.cpp
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