- be C99 friendly. Anonymous unions are a GNU extension. This change is

size-neutral WRT -std=gnu99 and fixes several compilation errors for strict
  C99 mode.

networking/arping.c

@@ -311,7 +311,7 @@ int arping_main(int argc, char **argv)
 	/* if (!inet_aton(target, &dst)) - not needed */ {
 		len_and_sockaddr *lsa;
 		lsa = xhost_and_af2sockaddr(target, 0, AF_INET);
-		memcpy(&dst, &lsa->sin.sin_addr.s_addr, 4);
+		memcpy(&dst, &lsa->u.sin.sin_addr.s_addr, 4);
 		if (ENABLE_FEATURE_CLEAN_UP)
 			free(lsa);
 	}