[tor-bugs] #14350 [Tor]: configure.ac: fix disabling systemd notification support

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#14350: configure.ac: fix disabling systemd notification support
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 Reporter:  blueness  |          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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 If --disable-systemd is given, we set $systemd to false, not
 $enable_systemd.  As a result, the way configure.ac is currently written,
 if libsystemd is found, we still turn on systemd support even if we
 explicitly disable it with --disable-system.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14350>
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