[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:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-gitian, TorBrowserTeam201707R,   |  Actual Points:
  GeorgKoppen201707                              |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by boklm):

 Replying to [comment:6 gk]:
 > Not sure if I did everything right but here comes my first review
 request via `oniongit`. https://oniongit.eu/gk/tor-browser-
 bundle/merge_requests/1

 This change looks good.

 I tried doing a build with rbm and this gcc version and it built without
 error.

 Corresponding changes in tor-browser-build.git: https://oniongit.eu/boklm
 /tor-browser-build/merge_requests/1

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20929#comment:11>
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