[pkg-lighttpd] Bug#846299: #846299: lighttpd depends on systemd

[Christian Hofstaedtler]

Control: severity -1 normal

Extra dependencies that are harmless certainly do not qualify as
"severity serious".

Also note that while this would help installability on kfreebsd,
right now lighttpd does not even build there.

-- 
 ,''`.  Christian Hofstaedtler <zeha at debian.org>
: :' :  Debian Developer
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