i965/gen7: Add support for gl_PointCoord.
This is exactly analogous to Eric's Gen6 change in commit 6861a701. His explanation: "This is just like PointSprite overrides, but it's always on for that attribute." Fixes glsl-fs-pointcoord and gtf/point_sprites. Signed-off-by:Eric Anholt <eric@anholt.net> Signed-off-by:
Kenneth Graunke <kenneth@whitecape.org> NOTE: This is a candidate for the 7.11 branch.
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