i965: Delete pre-DRI2.3 viewport hacks.
The __DRI_USE_INVALIDATE extension was added in May 11th, 2010 by commit 4258e3a2. At this point, it's unlikely that anyone's using the right mix of new and old components to hit this path. Deleting it removes an untested code path and cleans up the driver a bit. Cc: Kristian Høgsberg <email@example.com> Cc: Keith Packard <firstname.lastname@example.org>
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