Bug#830930: lintian: dh --with systemd is now builtin

[Christian Hofstaedtler <zeha@debian.org>]

* Michael Biebl <biebl@debian.org> [160713 00:38]:
> > starting in debhelper 9.20160709, "--with systemd" support is built
> > into debhelper. As such, the following lintian error is now wrong:
[..]

> I would keep the warning but it should say that it needs a versioned
> b-dep on debhelper instead.

I assume this needs special casing, given all the references to
dh-systemd vanish when one calls `private/refresh-debhelper-data` in
lintians source.

Also, checks/systemd.desc probably needs a text update now (it says
"please use the <tt>dh-systemd</tt> debhelper").

Thanks!
-- 
 ,''`.  Christian Hofstaedtler <zeha@debian.org>
: :' :  Debian Developer
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