[1/5] DDraw: Fix an incorrect iface->impl cast

[Stefan Dösinger]

This is a series of patches to make native d3drm work better. There are still 
a lot of bugs left afterwards, but its getting better.

Those are patches 3-7 because 1 and 2 are the multithreading patch and high 
order patches which I'm going to fix later today. The ddraw patches are 
independent of them.
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