dzn: Fixes to get 3DMark Wild Lands working (again)

The changes for DOOM broke this app: there's a shader compiler fix it needs, plus a fix to the non-bindless binding model, plus a couple other minor fixes (I probably was on a driver that sent it down different paths before). The rest of this series is attempts to get the app working (with not terrible performance) with bindless - there's improvements, but it's not there yet, so the last patch makes sure we don't turn on bindless by default yet.