localename: Fix test failure on AIX 7. Reported by Assaf Gordon in <https://lists.gnu.org/archive/html/sed-devel/2018-12/msg00019.html>. * m4/intl-thread-locale.m4 (gt_FUNC_USELOCALE): New macro. (gt_INTL_THREAD_LOCALE_NAME): Invoke it. Test gt_cv_func_uselocale_works instead of ac_cv_func_uselocale. * lib/localename.c: Test HAVE_WORKING_USELOCALE instead of HAVE_USELOCALE. * lib/localename-table.h: Likewise. * lib/localename-table.c: Likewise. * tests/test-localename.c: Likewise. * doc/posix-functions/uselocale.texi: Mention the AIX problem.

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