[tor-bugs] #26560 [Core Tor/Tor]: install more optional libs for Travis CI

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#26560: install more optional libs for Travis CI
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     Reporter:  catalyst      |      Owner:  catalyst
         Type:  enhancement   |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-ci, fast-fix
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 We have optional dependencies on libseccomp and libcap, but we're not
 building with them in Travis CI.  We should add them.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26560>
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