[tor-bugs] #20023 [Applications/Tor Browser]: Upgrade Go to 1.7.3

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#20023: Upgrade Go to 1.7.3
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 Reporter:  dcf                               |          Owner:  dcf
     Type:  task                              |         Status:
                                              |  needs_review
 Priority:  Medium                            |      Milestone:
Component:  Applications/Tor Browser          |        Version:
 Severity:  Normal                            |     Resolution:
 Keywords:  tbb-gitian TorBrowserTeam201611R  |  Actual Points:
Parent ID:                                    |         Points:
 Reviewer:                                    |        Sponsor:
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Comment (by gk):

 OKay, I applied the patch to master and hardened-builds (commits
 824043e9b60c322c4c95b91478acadd0412a2e6d and
 a10116149af502d483bea0a347a880eb2c7faf42). As a note: removing the $FLAGS
 is probably problematic for FTE but that is not built currently due to
 #18495. Thus, we can adjust those flags if needed once that bug is sorted
 out.

 This should be available in the next alpha release. I am still torn about
 taking this into stable, though. Especially as other PTs are potentially
 affected by any Go related issues that could come up.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20023#comment:10>
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