[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 lutz.horn@…):

 Replying to [comment:3 nicholas@…]:
 > Should the Portfile build Go 1.4 as a prerequisite to building Go 1.5?
 Or would it be preferable to add Go support to
 [browser:trunk/dports/lang/gcc5/Portfile gcc5] (possibly as a variant) and
 specify it as a build dependency?

 As a Go developer, I'd prefer not to have Go 1.4 installed in addition.
 But if this is the easier and faster approach to have Go 1.5 available in
 MacPorts, this option would be OK for me.

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Ticket URL: <https://trac.macports.org/ticket/48940#comment:4>
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