configure: on darwin add CoreFoundation to flags before checking for gettext

macOS needs to link to CoreFoundation for gettext to work. We reorder the
autoconf tests so CoreFoundation is added to LIBS earlier and the -lintl test
does not fail (which would exclude it from the final set of flags).

configure.ac

@@ -2839,6 +2839,11 @@ void *x = uuid_enc_be
 # pthread (first!) on Linux
 AC_SEARCH_LIBS(sem_init, pthread rt posix4)
 
+if test $ac_sys_system = Darwin
+then
+  LIBS="$LIBS -framework CoreFoundation"
+fi
+
 # check if we need libintl for locale functions
 AC_CHECK_LIB(intl, textdomain,
 	[AC_DEFINE(WITH_LIBINTL, 1,
@@ -5169,11 +5174,6 @@ if test "x$ac_cv_file__dev_ptc" = xyes; then
   [Define to 1 if you have the /dev/ptc device file.])
 fi
 
-if test $ac_sys_system = Darwin
-then
-	LIBS="$LIBS -framework CoreFoundation"
-fi
-
 AC_CACHE_CHECK([for %zd printf() format support], ac_cv_have_size_t_format, [dnl
 AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdio.h>