Update GENERIC-RD to include some missing 5.3 drivers, most importantly those for VirtIO, and remove some obsolete (5.3 and post-5.3) drivers.
Add 'screen' termcap entry; also required for tmux.
Feature: unpack plain tgz and pkg files also from subdirs named after the running kernel's version. Helps keep tgz and pkg files separate for different kernel versions and simplyfies switching between kernel versions.
Add more standard executables to the ramdisk: dirname, tmux, iked, ikectl, npppd, npppctl, relayd, relayctl, ifstated, tftp-proxy. While at it, clean up for obsolete wicontrol.
Don’t include etc/hostname.if files and etc/banner in ramdisk.