The point is that it's common between the rest of the arches,
no need to keep making my old mistake of growing configuration
trees based on very different "roots" (.e2k-installer this time
which was good for early experiments but not for production).

Also get rid of long-unused distro/alt-workstation-?01 targets,
unified kernel made those obsolete.

And last but not least: *drop* that setup-libgl-dri3-disable,
makes Radeon RX lag (half-recent AMD GPUs seem to lack 2D part
rather altogether, it's emulated through 3D).