Navigator: more cleanup, prune unused functions

src/modules/navigator/navigator_main.cpp

@@ -171,21 +171,6 @@ private:
 	 */
 	void		control_update();
 
-	/**
-	 * Check for changes in vehicle status.
-	 */
-	void		vehicle_status_poll();
-
-	/**
-	 * Check for position updates.
-	 */
-	void		vehicle_attitude_poll();
-
-	/**
-	 * Check for set triplet updates.
-	 */
-	void		mission_poll();
-
 	/**
 	* Retrieve mission.
 	*/