gettext

bf3a7355 - Fix test failures on AIX 7.2.

Fix test failures on AIX 7.2. * gettext-tools/tests/intl-thread-1-prg.c: Test HAVE_WORKING_USELOCALE instead of HAVE_USELOCALE. * gettext-tools/tests/intl-thread-2-prg.c: Likewise. * gettext-tools/tests/intl-thread-3-prg.c: Likewise.