[libcxx-commits] [clang] [libcxx] [libc++] Rename `__` prefix to `__libcpp_` for locale related functions (PR #119241)

[Louis Dionne via libcxx-commits]

ldionne wrote:

Closing in the meantime, please reopen this PR or create a new one with the new approach whenever you're ready!

https://github.com/llvm/llvm-project/pull/119241