[php-src] Issue #11662: ext/sockets/tests/bug63000.phpt fails when multicast disabled

Issue: https://github.com/php/php-src/issues/11662 Author: orlitzky ### Description This test tries to set a multicast socket option, ``` $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); socket_bind($socket, '0.0.0.0', 31057); $so = socket_set_option($socket, IPPROTO_IP, MCAST_JOIN_GROUP, array( "group" => '224.0.0.251', "interface" => 0, )); var_dump($so); ``` but even on Linux, the ability to do so is not guaranteed. For example, if you run the test in its own network namespace, ``` $ unshare -n sapi/cli/php ./run-tests.php ext/sockets/tests/bug63000.phpt ``` you'll get an error, ``` ---- EXPECTED OUTPUT bool(true) ---- ACTUAL OUTPUT Warning: socket_set_option(): Unable to set socket option [19]: No such device in ...bug63000.php on line 5 bool(false) ---- FAILED ``` The reason is that multicast first has to be enabled on a "new" network interface. Specifically, both of the following seem necessary, ``` $ ifconfig lo multicast $ route add -net 224.0.0.0 netmask 224.0.0.0 lo ``` before the test will work. I'm not really sure what the best way around this is. A simpler test for basic multicast support in SKIPIF? ### PHP Version php-8.2.8 ### Operating System _No response_