[libc] Stub out message catalog functions from <nl_types.h> (#164360) Create a POSIX `<nl_types.h>` header with `catopen`, `catclose`, and `catgets` function declarations. Provide the stub/placeholder implementations which always return error. This is consistent with the way locales are currently (un-)implemented in llvm-libc. Notably, providing `<nl_types.h>` fixes the last remaining issue with building libc++ against llvm-libc (on certain configuration of x86_64 Linux) after disabling threads and wide-characters in libc++.
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