[clang] [clang][CMake][Darwin] Make HOST_LINK_VERSION a CACHE option on Darwin (PR #203917)

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yueshe wrote:

I don't think the CI failure is related to my change... seeing similar failures in another PR https://github.com/llvm/llvm-project/actions/runs/27554342403/job/81449088159

https://github.com/llvm/llvm-project/pull/203917