graphics/mesa-devel: unbreak clover on iris/crocus after 222ad6365e18
$ IRIS_ENABLE_CLOVER=1 clpeak
WARNING: OpenCL support via iris driver is incomplete.
For a complete and conformant OpenCL implementation, use
https://github.com/intel/compute-runtime instead
Platform: rusticl
clCreateContextFromType (-1)
Regressed by: https://gitlab.freedesktop.org/mesa/mesa/-/commit/82e9880b04f3