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

[Zachary Turner]

Fix an issue with a stack smash.

There is still an outstanding issue remaining after this patch, which is that link cannot locate libraries.  I think we can address this in a followup patch by adding some library paths to the link line similar to how we already do for system include paths that we pass to cl.

http://reviews.llvm.org/D5845

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