WineD3D: WineD3D: Use the shader backend to enable / disable atifs and nvts

[Ivan Gyurdiev]

> What are your opinions?
I can't comment on the specifics of the state table design - would have 
to leave that to Henri. However, anything that increases modularity is a 
good thing. I'm in favor of the overall direction to break up the 
pipeline into component stages.  Smaller components are more easy to 
manage - specifically in your case this should allow separate backends 
to be chosen per pipeline stage.

It seems reasonable that these changes would be deferred until after 1.0.

Ivan