mesa: fix DXT1 support with EXT_texture_compression_dxt1
So, I forgot to add stable tag in a commit and here I'm trying to get the commit to stable. Hopefully I got it right, cc @eric .
mesa: fix DXT1 support with EXT_texture_compression_dxt1
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/11987
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: David Heidelberg <david@ixit.cz>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31540>