AP_Vehicle: replace header guard with pragma once

libraries/AP_Vehicle/AP_Vehicle.h

@@ -12,8 +12,8 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef AP_VEHICLE_H
-#define AP_VEHICLE_H
+#pragma once
+
 /*
   this header holds a parameter structure for each vehicle type for
   parameters needed by multiple libraries
@@ -54,5 +54,3 @@ public:
 
 
 #include "AP_Vehicle_Type.h"
-
-#endif // AP_VEHICLE_H

libraries/AP_Vehicle/AP_Vehicle_Type.h

@@ -12,8 +12,7 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-#ifndef AP_VEHICLE_TYPE_H
-#define AP_VEHICLE_TYPE_H
+#pragma once
 
 /*
   define common vehicle build types. Note that the APM_BUILD_DIRECTORY
@@ -38,5 +37,3 @@
 #else
 #define APM_BUILD_TYPE(type) ((type) == APM_BUILD_UNKNOWN)
 #endif
-
-#endif // AP_VEHICLE_TYPE_H