api-impl: add stubs to make AnimationDrawable and Animation not cause lockups

apps may (ab)use AnimationDrawable.run and Animation.setAnimationListener
to time transitions between states; even though we don't currently implement
the animations, state transitions are still desirable (otherwise the app may
lock up)

src/api-impl/android/hardware/SensorManager.java

@@ -35,6 +35,10 @@ public class SensorManager {
 		}
 	}
 
+	public void unregisterListener(final SensorEventListener listener) {
+		unregisterListener(listener, null);
+	}
+
 	public void unregisterListener(final SensorEventListener listener, Sensor sensor) {
 		System.out.println("STUB: andoroid.hw.SensorManager.unregisterListener");
 	}