Add ipv6 skipif to test

This was done for the -unix variant, but not the (formerly
windows-only?) main test.

ext/sockets/tests/socket_sendrecvmsg_multi_msg.phpt

@@ -4,12 +4,16 @@ sendmsg()/recvmsg(): test ability to receive multiple messages (WIN32)
 <?php
 if (!extension_loaded('sockets'))
 	die('skip sockets extension not available.');
+
+require 'ipv6_skipif.inc';
+
 if (!defined('IPPROTO_IPV6'))
 	die('skip IPv6 not available.');
 /* Windows supports IPV6_RECVTCLASS and is able to receive the tclass via
  * WSARecvMsg (though only the top 6 bits seem to reported), but WSASendMsg
- * does not accept IPV6_TCLASS messages. We still  test that sendmsg() works
- * corectly by sending an IPV6_PKTINFO message that will have no effect */
+ * does not accept IPV6_TCLASS messages. We still test that sendmsg() works
+ * correctly by sending an IPV6_PKTINFO message that will have no effect */
+?>
 --FILE--
 <?php
 include __DIR__."/mcast_helpers.php.inc";