dccp: snoop, build system fixes

@@ -234,10 +234,14 @@
 
                         case IPPROTO_UDP:
                                 (void) interpret_udp(flags,
                                     (struct udphdr *)data, new_iplen, fraglen);
                                 break;
+                        case IPPROTO_DCCP:
+                                (void) interpret_dccp(flags,
+                                    (struct dccphdr *)data, new_iplen, fraglen);
+                                break;
                         /* default case is to not print anything else */
                 }
 
         return (ahlen);
 }