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If this environment variable is set, then a detected compute engine will be used as described in docs/envvars.rst. Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Caio Oliveira <caio.oliveira@intel.com> Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14395>