stop multicast during rig_close

https://github.com/Hamlib/Hamlib/issues/1405

src/rig.c

@@ -1541,6 +1541,8 @@ int HAMLIB_API rig_close(RIG *rig)
 
     morse_data_handler_stop(rig);
     async_data_handler_stop(rig);
+    network_multicast_publisher_stop(rig);
+    while(rs->multicast_publisher_run != 2) hl_usleep(10*1000);
     //multicast_stop(rig);
 
     /*