Bug#986651: systemd: stop depending on systemd-timesyncd

[Helmut Grohne]

Package: systemd
Version: 247.3-3
Tags: bookworm sid

systemd used to include systemd-timesyncd. Now it is split out to a
separate binary package. Thanks. However, systemd now depends on
systemd-timesyncd, so we cannot really remove it (unless installing
something like ntp). For containers, having a time-daemon is not useful
and we want to reduce the filesystem as much as possible. Therefore it
would be good to reduce the dependency to Recommends.

Michael pointed out however that doing so would break installing
systemd-timesyncd by default as debootstrap does not honour Recommends.
It does however use the Priority and a default debootstrap will include
Priority: important packages.

So how about demoting the dependency to Recommends while simultaneously
bumping systemd-timesyncd's Priority to important?

Of course this can only implemented post bullseye, because that is the
first release to ship a systemd-timesyncd separate at all. Demoting it
now would risk loosing it in upgrades. Besides that, the change would be
inappropriate to the freeze policy.

Helmut