Bugfix: Add config.h include to files missing it

driver-drillbit.c

@@ -8,6 +8,8 @@
  * any later version.  See COPYING for more details.
  */
 
+#include "config.h"
+
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>

driver-hashbusteravalon.c

@@ -7,6 +7,8 @@
  * any later version.  See COPYING for more details.
  */
 
+#include "config.h"
+
 #include <stdbool.h>
 #include <stdlib.h>