ffvertex: don't touch tex coords if coord replace is enabled.

ffvertex: don't touch tex coords if coord replace is enabled.

The fixed function vertex program shouldn't need to deal or touch tex coords
if stuffing is enabled.

Though I'm not 100% this won't break assumption made elsewhere it seems like
the correct thing to do, and makes r300g point sprites a lot easier to implement.

draw: fix point-sprite when vertex program is used.

This commit regressed draw, so fix it as well to help bisection.

Signed-off-by: Dave Airlie <airlied@redhat.com>