RC_Channel: make example compile again

By adding a missing library dependency. Also remove unnecessary
includes, in particular including each board HAL file is not needed
anymore.

libraries/RC_Channel/examples/RC_Channel/RC_Channel.cpp

@@ -11,40 +11,8 @@
 #define CH_7 6
 #define CH_8 7
 
-#include <AP_Common/AP_Common.h>
-#include <AP_Progmem/AP_Progmem.h>
 #include <AP_HAL/AP_HAL.h>
-#include <AP_Param/AP_Param.h>
-#include <StorageManager/StorageManager.h>
-#include <AP_Math/AP_Math.h>
 #include <RC_Channel/RC_Channel.h>
-#include <AP_HAL_AVR/AP_HAL_AVR.h>
-#include <AP_HAL_SITL/AP_HAL_SITL.h>
-#include <AP_HAL_PX4/AP_HAL_PX4.h>
-#include <AP_HAL_Empty/AP_HAL_Empty.h>
-#include <AP_Baro/AP_Baro.h>
-#include <AP_ADC/AP_ADC.h>
-#include <AP_GPS/AP_GPS.h>
-#include <AP_InertialSensor/AP_InertialSensor.h>
-#include <AP_Notify/AP_Notify.h>
-#include <DataFlash/DataFlash.h>
-#include <GCS_MAVLink/GCS_MAVLink.h>
-#include <AP_Mission/AP_Mission.h>
-#include <StorageManager/StorageManager.h>
-#include <AP_Terrain/AP_Terrain.h>
-#include <AP_Compass/AP_Compass.h>
-#include <AP_Declination/AP_Declination.h>
-#include <SITL/SITL.h>
-#include <Filter/Filter.h>
-#include <AP_AHRS/AP_AHRS.h>
-#include <AP_Airspeed/AP_Airspeed.h>
-#include <AP_Vehicle/AP_Vehicle.h>
-#include <AP_ADC_AnalogSource/AP_ADC_AnalogSource.h>
-#include <AP_NavEKF/AP_NavEKF.h>
-#include <AP_Rally/AP_Rally.h>
-#include <AP_Scheduler/AP_Scheduler.h>
-#include <AP_HAL/UARTDriver.h>
-#include <AP_RangeFinder/AP_RangeFinder.h>
 
 const AP_HAL::HAL& hal = AP_HAL::get_HAL();
 

libraries/RC_Channel/examples/RC_Channel/make.inc

@@ -24,3 +24,4 @@ LIBRARIES += Filter
 LIBRARIES += GCS_MAVLink
 LIBRARIES += RC_Channel
 LIBRARIES += StorageManager
+LIBRARIES += AP_OpticalFlow