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/osdep/haiku/getroot.c

@@ -1,5 +1,5 @@
-#include <config.h>
 #include <config-util.h>
+#include <config.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <string.h>