i965: Drop VECTOR_MASK_ENABLE in Broadwell's 3DSTATE_VS packet.
i965: Drop VECTOR_MASK_ENABLE in Broadwell's 3DSTATE_VS packet.

We never set it on previous generations, but I had to set it in
3DSTATE_PS for correct behavior.  For symmetry, I set it in 3DSTATE_VS
as well, but there's no actual need to do so.  Piglit works fine either
way.  The documentation also remarks that there should never be a need
to program this.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Eric Anholt <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@anholt.net>

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