update systemd

[der.hans]

moin moin,

an important systemd fix is on it's way into distributions.

https://marc.ttias.be/oss-security/2016-09/msg00243.php

The following article has a click-bait title :(, but some salient things
to consider for systemd.

https://www.agwa.name/blog/post/how_to_crash_systemd_in_one_tweet

ciao,

der.hans
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