vtn/opencl: native sqrt support

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-By: Karol Herbst <kherbst@redhat.com>
Part-of: <mesa/mesa!4811>
53 jobs for !4811 with vtn_opencl_missing_native_ops in 21 minutes and 50 seconds (queued for 5 seconds)
merge request