Rusticl Lands Fixes For Rust-OpenCL Discrete GPU Support, Preps SPIR-V Program Support

Merged for Mesa 22.3 one month ago was Rusticl as a new OpenCL implementation written in Rust. Since then Karol Herbst of Red Hat, who has led the work on this new driver front-end, has been working to get Rusticl running on more Gallium3D drivers and even atop Zink for execution with Vulkan drivers. Much of his testing/focus so far has been making use of integrated GPUs while an important patch series was merged this evening for discrete GPU fixes...