[clang] [libclc] [llvm] [libclc] More cross compilation fixes (PR #97811)

[Harald van Dijk via cfe-commits]

hvdijk wrote:

Both buildbot failures appear to be unrelated to this PR: neither fails in libclc, the first has resolved itself and passes in later attempts, the second looks like the builder has just run out of disk space. If I am wrong and there is something I should look into please let me know, otherwise I will leave it.

https://github.com/llvm/llvm-project/pull/97811