[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 kuznetsov.alexey@…):

 can you please add +variant for windows, linux32/64, mac builds?

 /opt/local/go/src/make.bash

 GOOS=windows GOARCH=386 ./make.bash --no-clean
 GOOS=windows GOARCH=amd64 ./make.bash --no-clean
 GOOS=darwin GOARCH=386 ./make.bash --no-clean
 GOOS=linux GOARCH=amd64 ./make.bash --no-clean

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Ticket URL: <https://trac.macports.org/ticket/48940#comment:2>
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