[libcxx-commits] [libcxx] [libcxx] Remove clang-18 workaround in picolib build (PR #133254)

[Mark de Wever via libcxx-commits]

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

FYI I just landed the Clang-18 support removal patch.

LGTM, but I've some drive-by suggestions. 

https://github.com/llvm/llvm-project/pull/133254