Removes socket from the multicast group defined by group, iface,
and source_specific (which must all have the same values they had
when you joined the group).
socket remains bound to its address and port, and can still receive
unicast messages after calling this.
Removes socket from the multicast group defined by group, iface, and source_specific (which must all have the same values they had when you joined the group).
socket remains bound to its address and port, and can still receive unicast messages after calling this.