Include "version.cuh" from "util_namespace.cuh" so that we can include a header that has always existed in Thrust when checking for older versions of CUB.
Include "version.cuh" from "util_namespace.cuh" so that we can include a header
that has always existed in Thrust when checking for older versions of CUB.

Bug 2950372

NVlabs/CUB,NVlabs/cub,NVIDIA/cub