* libguile/locale-categories.h (MESSAGES): Add condition on
  !(defined(LC_MAX) && LC_MESSAGES > LC_MAX).
* test-suite/tests/i18n.test ("locale objects")["make-locale (2 args,
  list)", "make-locale (3 args)", "locale?"]: Use LC_NUMERIC or LC_TIME
  instead of LC_MESSAGES.

Co-authored-by: Eli Zaretskii <eliz@gnu.org>