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

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#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):

 I missed the most obvious build to remove:
 * 0.2.9:
   - skip Linux gcc with the default env, because all the non-default
 builds use Linux gcc (-1 job on 0.2.9 and later)

 So we're down to:
 * 9 jobs on 0.3.4 and later
 * 7 jobs on 0.3.2 and 0.3.3
 * 4 jobs on 0.2.9

 I really do think we have a minimal set now.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27252#comment:7>
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