[2/5] wined3d: Fix depth buffer formats to use actual depth textures

[Ivan Gyurdiev]

That's still missing runtime check for GL_ARB_DEPTH_TEXTURE extension. I 
don't like "developers only" and "registry key" - feature should be 
complete or not in the tree.

 > The trouble with the current setup is that we can't use different 
formats based on what extensions
are present.

Then the setup should be fixed, rather than adding dependent code 
without extension checks. I might have mentioned before that statically 
initialized tables are evil....

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Btw, good job, I am glad you're working on this.... does it make 
Battlefield 2 work?