Despite the version number confusion, this is a new version of
discord-canary, but since the build is now public/official, the version
number has been reset and the canary suffix has been dropped.
Note that this means that the executable has been renamed from
DiscordCanary to Discord
This moves libsystemd.so and libudev.so into systemd.lib, and gets rid
of libudev (which just contained a copy of libudev.so and the udev
headers). It thus reduces the closure size of all packages that
(indirectly) depend on libsystemd, of which there are quite a few (for
instance, PulseAudio and dbus). For example, it reduces the closure of
Blender from 430.8 to 400.8 MiB.
