Revert "asahi: Advertise ARB_texture_barrier"
Revert "asahi: Advertise ARB_texture_barrier"
This reverts commit 9e67d3f2.
We do not, in fact, implement texture barriers. Texture barriers are supposed to allow non-overlapping rendering feedback loops. We cannot support that at non-tile boundaries when texture compression is enabled without some kind of downgrade path or other special handling.
Fixes Emacs corruption on X/Glamor.