GCS_MAVLink: don't route RADIO and RADIO_STATUS packets

they don't mean anything off the local link

libraries/GCS_MAVLink/MAVLink_routing.cpp

@@ -102,6 +102,12 @@ bool MAVLink_routing::check_and_forward(mavlink_channel_t in_channel, const mavl
     // learn new routes
     learn_route(in_channel, msg);
 
+    if (msg->msgid == MAVLINK_MSG_ID_RADIO ||
+        msg->msgid == MAVLINK_MSG_ID_RADIO_STATUS) {
+        // don't forward RADIO packets
+        return true;
+    }
+    
     if (msg->msgid == MAVLINK_MSG_ID_HEARTBEAT) {
         // heartbeat needs special handling
         handle_heartbeat(in_channel, msg);