Add mac.h -- raw_ip.c was depending on nested inclusion of mac.h which

is no longer present.

Pointed out by:	bmilekic
Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

sys/netinet/raw_ip.c

@@ -42,6 +42,7 @@
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/lock.h>
+#include <sys/mac.h>
 #include <sys/malloc.h>
 #include <sys/mbuf.h>
 #include <sys/proc.h>