[tor-bugs] #28378 [Core Tor/Tor]: Add libsystemd-devel to the travis config, if available

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#28378: Add libsystemd-devel to the travis config, if available
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  teor
         Type:  defect   |     Status:  assigned
     Priority:  Medium   |  Milestone:  Tor: 0.4.0.x-final
    Component:  Core     |    Version:  Tor: unspecified
  Tor/Tor                |   Keywords:  fast-fix, tor-systemd,
     Severity:  Normal   |  029-backport, 033-backport, 034-backport,
                         |  035-backport
Actual Points:           |  Parent ID:  #28113
       Points:           |   Reviewer:
      Sponsor:           |
-------------------------+-------------------------------------------------
 In #28113, we discovered that libsystemd-devel was not installed in
 travis. We should install it, and build with it.

 We should probably do #28377 at the same time.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28378>
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