Use Clang version numbers for the Windows VERSIONINFO resource.

When setting the VERSIONINFO resource to embed version information into exe and
DLL files on Windows, override the default LLVM version number values with their
clang equivalents.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@239617 91177308-0d34-0410-b5e6-96231b3b80d8