[PATCH] Windows ToolChain: remove excessive backslash if we find WindowsSDK

[Reid Kleckner]

Thanks for the info, this should be fixed in r206933.

BTW, I recommend not relying on that registry searching code. It's not well
maintained. The best way to make sure you're getting the right VC and SDK
headers is to set INCLUDE in the environment, most likely with
vcvarsall.bat.

http://reviews.llvm.org/D3440

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