ArduCopter: correct compilation with AP_RRSI_ENABLED false

Co-authored-by: David Buzz <davidbuzz@gmail.com>

ArduCopter/Copter.cpp

@@ -583,9 +583,11 @@ void Copter::ten_hz_logging_loop()
     }
     if (should_log(MASK_LOG_RCIN)) {
         logger.Write_RCIN();
+#if AP_RSSI_ENABLED
         if (rssi.enabled()) {
             logger.Write_RSSI();
         }
+#endif
     }
     if (should_log(MASK_LOG_RCOUT)) {
         logger.Write_RCOUT();

ArduCopter/Parameters.cpp

@@ -634,10 +634,12 @@ const AP_Param::Info Copter::var_info[] = {
     GOBJECTN(mode_auto.mission, mission, "MIS_", AP_Mission),
 #endif
 
+#if AP_RSSI_ENABLED
     // @Group: RSSI_
     // @Path: ../libraries/AP_RSSI/AP_RSSI.cpp
     GOBJECT(rssi, "RSSI_",  AP_RSSI),
-    
+#endif
+
 #if AP_RANGEFINDER_ENABLED
     // @Group: RNGFND
     // @Path: ../libraries/AP_RangeFinder/AP_RangeFinder.cpp

ArduCopter/system.cpp

@@ -27,9 +27,11 @@ void Copter::init_ardupilot()
     // initialise battery monitor
     battery.init();
 
+#if AP_RSSI_ENABLED
     // Init RSSI
     rssi.init();
-    
+#endif
+
     barometer.init();
 
     // setup telem slots with serial ports