Newer systemd/udev 241-3 breaks GUI output

The recent systemd update in Debian 241-1 -> 241-3 broke the compositor.

The issue is that we're not honoring ETNA_MESA_DEBUG=no_supertile. Downgrading

first

apt-get install systemd=241-1 libsystemd0=241-1 libpam-systemd=241-1

then

apt-get install libudev1=241-1 libnss-systemd=241-1 systemd-sysv=241-1 udev=241-1 systemd-coredump=241-1

works around the isse (via

deb     https://snapshot.debian.org/archive/debian/20190410T111800Z/ buster main

). Since only the