rusticl: support zink

I've kept that code in a branch for too long. Should probably merge it.

Passes most of the CTS, like 99%, at least on ANV the last time (<5 hours ago) I've tried. Random stuff not working, but nothing concerning. Probably causes the Vulkan validation layer to go nuts and cry.

What works:

• probably a lot
• clinfo
• luxmark v3.1 luxball benchmark
• and much more (probably)

Depends on:

• !24831 (merged)
• !24835 (merged)
• !24905 (merged)
• !24939 (merged)
• !25330 (merged)