WineD3D: Make CreateCubeTexture fail when not supported

[Luke Bratch]

> Not tested under Windows (does _anyone_ besides me
have a Matrox? :) - 
> would be nice if someone with either an MGA or an
really ancient GPU 
> could run the test on windows (if the pool=0 trace
has an hr!=0 you got 
> one of those ancient cards :). CCing to wine-devel
for that reason.

Somewhere I have an ancient Matrix MGA G200 AGP
card...  If this would be of any use, I'll dig it out
and run any tests in Wine/Windows that you'd like?


	
	
		
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