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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 <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>