[Pkg-utopia-maintainers] Bug#752296: dependency on systemd is not needed

[Adam Borowski]

> That's not a bug and the dependency is intentional since udisks requires
> the session tracking provided by systemd-logind.

It turns out this is not true: if you remove the runtime dependency, it does
notice systemd is not present and will work just fine -- with no systemd
component installed at all, including no -shim.

My changes were to just remove libpam-systemd from depends, without altering
build-depends.

This suggests dropping the support for kfreebsd was not warranted as well.

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