Changed QEMU device from -device virtio-gpu (2D only) to
-device virtio-vga-gl -display egl-headless for virgl 3D
acceleration testing. The virgl patches are already wired into
Mesa recipe.toml (6 patches); this enables the runtime probe
to select virgl instead of falling back to llvmpipe swrast.
Also updated test-phase4-wayland-qemu.sh (both expect and
smoke sections). Matches plan §5 Blocker Detail #3 fix.
vasilito
fb59077312