[libcxx-commits] [libcxx] [libc++][z/OS] Need to define _LIBCPP_HAS_UNICODE to 0 for EBCDIC (PR #119244)

[Louis Dionne via libcxx-commits]

ldionne wrote:

Well, the appropriate way to disable unicode would be to set `LIBCXX_ENABLE_UNICODE` to `OFF` in the CMake cache you likely have inside `libcxx/cmake/caches`. Regardless of a policy discussion, this patch is adding platform-specific logic to `__config_site`, and that's the wrong approach.

https://github.com/llvm/llvm-project/pull/119244