[tor-bugs] #20929 [Applications/Tor Browser]: Bump GCC version in our alpha builds

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#20929: Bump GCC version in our alpha builds
-------------------------------------+-------------------------------------
     Reporter:  gk                   |      Owner:  tbb-team
         Type:  enhancement          |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-gitian,
     Severity:  Normal               |  TorBrowserTeam201701
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 For the 7.0aX series we should bump the GCC version used to the latest
 stable in the 5.x series. The hardened builds are already done with GCC
 5.4.0, thus there is no reason to use a different GCC (currently 5.1.0) in
 the alphas.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20929>
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