[MacPorts] #48940: go: update to 1.5.1

[MacPorts]

#48940: go: update to 1.5.1
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  Reporter:  lutz.horn@…  |      Owner:  ciserlohn@…
      Type:  update       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  go           |
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Comment (by nicholas@…):

 It appears that using gccgo is not an option since it currently does not
 build on Darwin:
 https://github.com/golang/go/issues/10727

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Ticket URL: <https://trac.macports.org/ticket/48940#comment:5>
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