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

[Louis Dionne via libcxx-commits]

https://github.com/ldionne requested changes to this pull request.

Instead, can't you `#undef` these macros? We're trying to move away from defining names with `__libcpp`.

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