[tor-bugs] #14170 [Tor]: Build broken on any platform lacking systemd

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#14170: Build broken on any platform lacking systemd
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 Reporter:  Sebastian  |          Owner:
     Type:  defect     |         Status:  new
 Priority:  normal     |      Milestone:  Tor: 0.2.6.x-final
Component:  Tor        |        Version:
 Keywords:             |  Actual Points:
Parent ID:             |         Points:
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 a8999acc3bca05f1aaa23399c7d5f7a5e51789a4 which was supposed to fix
 building of the systemd watchdog broke building on any platform without
 systemd. Just reverting that commit for now seems like the wrong idea,
 however, because the underlying issue still exists which isn't being
 addressed at all - the systemd configure check fails. I have a patch in
 branch systemd209 in my repo, but building that on my systemd-enabled
 jessie produces linking errors at the very end. I'm not too well versed in
 the systemd world, our entire detection magic needs to be checked for all
 cases because right now we even get the non-corner cases wrong.

 This was first reported by Toralf Förster <toralf.foerster at gmx.de> on
 #tor-dev as indicated in my commit msg

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14170>
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