All of our official releases (Flatpak and AppImage) already do this, so this just makes it official.
This can be overridden by running qmake with CONFIG+=enable-cuda.
These are only really useful for Wayland scenarios, but:
- Wayland is explicitly disabled for AppImage due to EGL issues
- VDPAU now works under XWayland with 545 and later drivers
- Moonlight now has a Vulkan Video backend which works with 535 and later drivers
Fixes#1314