[tor-bugs] #27252 [Core Tor/Tor]: Reduce the number of travis jobs

[Tor Bug Tracker & Wiki]

#27252: Reduce the number of travis jobs
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  rust tor-ci 029-backport-maybe       |  Actual Points:
  032-backport 033-backport 034-backport         |
Parent ID:                                       |         Points:
 Reviewer:  catalyst                             |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 It turns out that OS X gcc is an alias for clang, so our OS X gcc builds
 are redundant:
 https://github.com/travis-ci/docs-travis-ci-com/pull/2002

 Let's fix that in #27376, if we decide we want gcc on OS X.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27252#comment:8>
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