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Revert "asahi: Advertise ARB_texture_barrier"

Asahi Lina requested to merge asahilina/mesa:agx/no-texture-barrier into main

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.

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