wined3d: Fix ATI dx10 cards max varying quirk

[Robert Key]

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.

   Fixes bug #17437


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