Tracker: GCS_MAVLink uses compass singleton, stop implementing get_compass

AntennaTracker/GCS_Mavlink.cpp

@@ -609,11 +609,6 @@ void Tracker::gcs_retry_deferred(void)
     gcs().retry_deferred();
 }
 
-Compass *GCS_MAVLINK_Tracker::get_compass() const
-{
-    return &tracker.compass;
-}
-
 /*
   set_mode() wrapper for MAVLink SET_MODE
  */

AntennaTracker/GCS_Mavlink.h

@@ -14,7 +14,6 @@ protected:
     // as currently Tracker may brick XBees
     uint32_t telem_delay() const override { return 0; }
 
-    Compass *get_compass() const override;
     AP_Mission *get_mission() override { return nullptr; };
     AP_Rally *get_rally() const override { return nullptr; };
     AP_Camera *get_camera() const override { return nullptr; };