Add a missing include which was erroneusly left out from the previous

commit.

Sponsored by:	Nokia

sys/ddb/db_output.c

@@ -35,6 +35,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_ddb.h"
+
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/cons.h>