gettext

41cab627 - New test intl-thread-1.

New test intl-thread-1. * gettext-tools/tests/intl-thread-1: New file. * gettext-tools/tests/intl-thread-1-prg.c: New file. * gettext-tools/tests/intl-thread-1.po: New file. * gettext-tools/tests/Makefile.am: Update.