[Diffusion] rL239612: In MSVC builds embed a VERSIONINFO resource in our exe and DLL files.

[NAKAMURA Takumi]

/llvm/trunk/cmake/modules/AddLLVM.cmake:239 ${LLVM_SOURCE_DIR} might be undefined here in clang build. See;

  - http://bb.pgr.jp/builders/msbuild-llvmclang-x64-msc18-DA/builds/324
  - http://bb.pgr.jp/builders/msbuild-llvmclang-x64-msc18-DA/builds/327

Tweaked in r239703.

USERS
  gbedwell (Author)

http://reviews.llvm.org/rL239612

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