d3dx9/tests: Add DDS pixel format tests for D3DXGetImageInfoFromFileInMemory.

[Stefan Dösinger]

Am Donnerstag, 19. April 2012, 20:23:36 schrieb Matteo Bruni:
> I'm not sure that's a good idea. ddraw.h is not included in recent
> DirectX SDKs and the relevant definitions are "gone", as far as I
> know. So I think d3dx9 or its tests should not depend on that header.
Furthermore the ddraw.h types do not support volume textures, but d3dx9's .dds 
support does. So one more reason to declare your own structures.