[tor-bugs] #27468 [Core Tor/Tor]: CI: add builds with the latest clang and gcc

[Tor Bug Tracker & Wiki]

#27468: CI: add builds with the latest clang and gcc
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     Reporter:  teor          |      Owner:  teor
         Type:  enhancement   |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.3.5.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-ci
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 We could add the latest gcc and clang to our Travis matrix.

 Travis is running older gcc and clang versions:
 * Linux: Ubuntu's older clang and gcc
 * macOS: Apple's custom clang, no gcc

 Appveyor is already running gcc 8.2, and it seems to be updated every 6-12
 months.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27468>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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