5/3 WineD3D: Don't use blending on pixel formats which don't support it in combination with shaders

[Roderick Colenbrander]

Skip this one among with 5/3, 6/3 and 7/3. All other patches like 8/3 and 9/3 don't require this one and should apply fine.

Roderick

> Hi,
> 
> Windows drivers only offer post pixel shader blending support on generic
> (A)RGB-like formats and in case of dx10-class cards like the Geforce8 also
> on some float formats. Right now we enable blending even when it isn't
> needed. In case of R32F (if you would disable the software conversion code) this
> gives a 400% performance boost in http://www.angelcode.com/dev/shadow/.
> 
> A next patch will add D3DUSAGE_QUERY_PIXELFORMAT_BLENDING support.
> 
> Regards,
> Roderick Colenbrander

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