[libcxx-commits] [libcxx] [libc++] Reduce the dependency of the locale base API on the base system from the headers (PR #117764)

[Louis Dionne via libcxx-commits]

ldionne wrote:

It turns out this is breaking more code than I thought. I'll try to push this through the finish line and cherry-pick into LLVM 20.

https://github.com/llvm/llvm-project/pull/117764