[2/2] wined3d: Use gl_Color and gl_SecondaryColor to support more varyings in SM3.0 shaders

[H. Verbeet]

SM3.0 requires 10 4 component float varyings for passing stuff between
vertex and pixel shaders. GF7 and earlier report 8 generic varyings +
gl_Color and gl_SecondaryColor in GLSL. This patch allows us to use
gl_Color and gl_SecondaryColor to get 2 extra varyings, which some
games, like C&C3 with highest gfx settings, require.

Changelog:
  - Use gl_Color and gl_SecondaryColor to support more varyings in SM3.0 shaders
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