[tbb-bugs] #20927 [Applications/Tor Browser]: Upgrade Go to 1.7.4

[Tor Bug Tracker & Wiki]

#20927: Upgrade Go to 1.7.4
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     Reporter:  dcf                       |      Owner:  tbb-team
         Type:  task                      |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-gitian
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 1.7.4 is a security release.

 https://golang.org/doc/devel/release.html#go1.7
 > go1.7.4 (released 2016/12/01) includes two security fixes. See the
 [https://github.com/golang/go/issues?q=milestone%3AGo1.7.4 Go 1.7.4
 milestone] on our issue tracker for details.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20927>
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