Add tests for DirectDraw surface reference counting

[Stefan Dösinger]

Am Freitag, 15. Mai 2009 13:52:23 schrieb Luke Benstead:
> Reference counts are wrong in Wine which causes some games to fail.
> I'm working patches to make these tests pass so we can remove the
> todo_wine's.
>
> Luke.

The patch adds trailing whitespeaces in a few lines. Please remove them. 
Otherwise the code looks good to me.