[d3d8] Fix CreateImageSurface implementation (with testcase)

[H. Verbeet]

2008/6/20 Tobias Jakobi <liquid.acid at gmx.net>:
> However I think the comment should stay there. I don't think the MSDN
> docs are updated in the near future, at least what D3D9 is concerned
> (now that D3D10 is more and more used). So in case someone is wondering
> why the implementation of wine differs from the behaviour described in
> the MSDN this comment should clarify this.
>
>
> Now should I also add something about the scratch pool type?
>
I don't feel strongly about it, it's just that the comment talks a lot
about what MSDN says or doesn't say, without actually describing what
D3DPOOL_SCRATCH is supposed to mean, while ultimately that's all we
care about.