config: Where present, ensure config-util.h precedes config.h

gnulib defines go in config-util.h, and we need to know whether to
provide duplicates in config.h or not.

Signed-off-by: Robbie Harwood <rharwood@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/kern/emu/argp_common.c

@@ -17,8 +17,8 @@
  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <config.h>
 #include <config-util.h>
+#include <config.h>
 
 #pragma GCC diagnostic ignored "-Wmissing-prototypes"
 #pragma GCC diagnostic ignored "-Wmissing-declarations"