SCTP is not yet compatible with options VIMAGE kernels although it compiles

with VIMAGE defined, so explicitly disallow building such kernels.

Reviewed by:	rrs
Approved by:	re (rwatson), julian (mentor)

sys/netinet/sctp_os_bsd.h

@@ -78,6 +78,10 @@ __FBSDID("$FreeBSD$");
 #include <netinet/ip_icmp.h>
 #include <netinet/icmp_var.h>
 
+#ifdef VIMAGE
+#error "SCTP is not yet compatible with VIMAGE."
+#endif
+
 #ifdef IPSEC
 #include <netipsec/ipsec.h>
 #include <netipsec/key.h>