Plane: removed old angle wrap code

ArduPlane/navigation.pde

@@ -130,20 +130,6 @@ static void calc_altitude_error()
     altitude_error_cm       = target_altitude_cm - adjusted_altitude_cm();
 }
 
-static int32_t wrap_360_cd(int32_t error)
-{
-    if (error > 36000) error -= 36000;
-    if (error < 0) error += 36000;
-    return error;
-}
-
-static int32_t wrap_180_cd(int32_t error)
-{
-    if (error > 18000) error -= 36000;
-    if (error < -18000) error += 36000;
-    return error;
-}
-
 static void update_loiter()
 {
     float power;