[MacPorts] #53004: go @1.7.3: update to 1.7.4

[MacPorts]

#53004: go @1.7.3: update to 1.7.4
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 Reporter:  l2dy    |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  go
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 go1.7.4 (released 2016/12/01) includes two security fixes.

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Ticket URL: <https://trac.macports.org/ticket/53004>
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