mac: do not use libintl_setlocale() (#9789)

gettext contains libintl.h. That header file defines a macro that replaces
`setlocale` by `libintl_setlocale`. That function eventually calls the original
`setlocale()` from Apple's libc, but is known to make it fail.

Mac users with gettext from Homebrew can easily reproduce this:

    #include <stdio.h>
    #include <locale.h>
    #include <libintl.h>

    int main(void) {
      setlocale(LC_ALL, "");
      printf("locale: %s\n", setlocale(LC_CTYPE, NULL));
    }

Compile and run it:

    cc -I/usr/local/opt/gettext/include -L/usr/local/opt/gettext/lib -lintl -o test test.c && ./test

When $LC_CTYPE is set to a valid value like UTF-8, it should output:

    locale: UTF-8

But it does not. It returns C anyway. Remove libintl.h and recompile and you get
the expected UTF-8.

Fixes https://github.com/neovim/neovim/issues/9787

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