AP_Airspeed: Updated Airspeed example.

libraries/AP_Airspeed/examples/Airspeed/Airspeed.cpp

@@ -22,6 +22,7 @@
 #include <AP_Airspeed/AP_Airspeed.h>
 #include <AP_HAL/AP_HAL.h>
 #include <AP_BoardConfig/AP_BoardConfig.h>
+#include <GCS_MAVLink/GCS_Dummy.h>
 
 void setup();
 void loop();
@@ -74,4 +75,9 @@ void loop(void)
     hal.scheduler->delay(1);
 }
 
+const struct AP_Param::GroupInfo        GCS_MAVLINK::var_info[] = {
+    AP_GROUPEND
+};
+GCS_Dummy _gcs;
+
 AP_HAL_MAIN();