Android: remove SURFACE_TYPE_GPU, deprecated in API level 5.

https://developer.android.com/reference/android/view/SurfaceHolder

This constant was deprecated in API level 5. this is ignored, this value is set automatically when needed.

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

@@ -1582,7 +1582,6 @@ class SDLSurface extends SurfaceView implements SurfaceHolder.Callback,
     @Override
     public void surfaceCreated(SurfaceHolder holder) {
         Log.v("SDL", "surfaceCreated()");
-        holder.setType(SurfaceHolder.SURFACE_TYPE_GPU);
     }
 
     // Called when we lose the surface