i965: Make vertex color clamp handling code VS specific.

Vertex color clamping only applies to gl_[Secondary]{Front,Back}Color,
which are compatibility-only built-in varyings.  We only support GS in
core profile, so they can't exist in geometry shaders.

We can drop several dirty bits from the GS program key - they're
unnecessary for a core profile implementation.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Chris Forbes <[email protected]>

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