wined3d: Fix ATI dx10 cards max varying quirk

[Henri Verbeet]

2009/5/11 Robert Key <hpestilence at gmail.com>:
> Changelog:
> * This adds a quirk to change the default max varying value from
>   68 to 48 on ATI dx10 cards that use fglrx because a declaration
>   of 17 varying vec4s causes shaders not to render and using
>   48 (12 varyings vec4s) works for HD2000 to HD4000 ATI cards.
>
R600 and r700 are supposed to be actively supported. But you know, I
don't actually care anymore.