[PATCH] Make a good guess about where MSVC and Windows SDK libraries are for linking.

[Zachary Turner]

Hi aaron.ballman, hans, majnemer, rnk,

    When a user doesn't run vcvarsall, clang doesn't know where system
    libraries are located.  This patch causes clang to still use the
    configured environment variables when present, but when they are
    not present, to make a (very good) guess.

http://reviews.llvm.org/D5873

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