Changed motion listener implementation not to inherit from Activity c…

…lass.

android-project/src/org/libsdl/app/SDLActivity.java

@@ -885,7 +885,7 @@ public int getJoyId(int devId) {
 
 }
 
-class SDLGenericMotionHandler_API12 extends Activity implements View.OnGenericMotionListener {
+class SDLGenericMotionHandler_API12 implements View.OnGenericMotionListener {
     // Generic Motion (mouse hover, joystick...) events go here
     // We only have joysticks yet
     @Override