[llvm] [llvm][cmake] Properly place clang runtime directory on linker command line when WinMsvc.cmake is involved (PR #110084)

[via llvm-commits]

serge-sans-paille wrote:

The only thing that bothers me here is that in the end, we have two (potentially) different libs accessible from the libpaths. Prioritizing one against the other may be the right approach, but I'd feel more confident if we only have one. Have you tried removing the `-libpath` that introduces the redundancy from `WinMsvc.cmake` ?

https://github.com/llvm/llvm-project/pull/110084