[libcxx-commits] [libcxx] [libc++][z/OS] Switch to use TEST_HAS_NO_INT128 as per comment in PR 92261 (PR #92434)

[Mark de Wever via libcxx-commits]

https://github.com/mordante approved this pull request.

Thanks for the followup patch! LGTM!

https://github.com/llvm/llvm-project/pull/92434