Copter: fix compiler error when mount disabled

ArduCopter/GCS_Mavlink.pde

@@ -981,7 +981,9 @@ void GCS_MAVLINK::handleMessage(mavlink_message_t* msg)
 
     case MAVLINK_MSG_ID_GIMBAL_REPORT:
     {
+#if MOUNT == ENABLED
         handle_gimbal_report(camera_mount, msg);
+#endif
         break;
     }
 

ArduCopter/system.pde

@@ -191,8 +191,10 @@ static void init_ardupilot()
     // init the optical flow sensor
     init_optflow();
 
+#if MOUNT == ENABLED
     // initialise camera mount
     camera_mount.init(serial_manager);
+#endif
 
 #ifdef USERHOOK_INIT
     USERHOOK_INIT