Fix the Windows build. Now that the LLVM library is no longer added to the list of library directories the full path to the LLVM libraries needs to be specified.
Fix the Windows build. Now that the LLVM library is no longer
added to the list of library directories the full path to the LLVM
libraries needs to be specified.

Whilst we're here also change the globbing pattern so we only link
against libraries matching ``LLVM*.lib`` because we were linking against
the Clang libraries unnecessarily.

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