AP_Common: clean includes up in Location.h

libraries/AP_Common/Location.cpp

@@ -7,8 +7,6 @@
 #include <AP_AHRS/AP_AHRS.h>
 #include <AP_Terrain/AP_Terrain.h>
 
-extern const AP_HAL::HAL& hal;
-
 AP_Terrain *Location::_terrain = nullptr;
 
 /// constructors

libraries/AP_Common/Location.h

@@ -1,17 +1,7 @@
-/*
- * Location.h
- *
- */
-
+#pragma once
 
-#ifndef LOCATION_H
-#define LOCATION_H
-
-#include <AP_Common/AP_Common.h>
 #include <AP_Math/AP_Math.h>
-#include <AP_HAL/AP_HAL.h>
 
-class AP_AHRS_NavEKF;
 class AP_Terrain;
 
 #define LOCATION_ALT_MAX_M  83000   // maximum altitude (in meters) that can be fit into Location structure's alt field
@@ -111,5 +101,3 @@ public:
 private:
     static AP_Terrain *_terrain;
 };
-
-#endif /* LOCATION_H */