Avoid some Autoconf "was expanded before it was required" warnings. * m4/locale-ar.m4 (gt_LOCALE_AR): Define through AC_DEFUN_ONCE. * m4/locale-fr.m4 (gt_LOCALE_FR, gt_LOCALE_FR_UTF8): Likewise. * m4/locale-ja.m4 (gt_LOCALE_JA): Likewise. * m4/locale-tr.m4 (gt_LOCALE_TR_UTF8): Likewise. * m4/locale-zh.m4 (gt_LOCALE_ZH_CN): Likewise.