Fix for Visual Studio 2017

[Hamza Sood via cfe-commits]

Visual Studio 2017 changes the layout of its compiler tools (described here: https://blogs.msdn.microsoft.com/vcblog/2016/10/07/compiler-tools-layout-in-visual-studio-15/).
If there are no other Visual Studio versions installed, Clang will be unable to find link.exe and hence will fail at the linking stage. This patch should fix that.

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