Copter: AP_Arming integrates rename to using_noncompass_for_yaw

ArduCopter/AP_Arming.cpp

@@ -630,8 +630,8 @@ bool AP_Arming_Copter::arm_checks(AP_Arming::Method method)
     }
 
 #ifndef ALLOW_ARM_NO_COMPASS
-    // if external source of heading is available, we can skip compass health check
-    if (!ahrs.is_ext_nav_used_for_yaw()) {
+    // if non-compass is source of heading we can skip compass health check
+    if (!ahrs.using_noncompass_for_yaw()) {
         const Compass &_compass = AP::compass();
         // check compass health
         if (!_compass.healthy()) {