[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@…):

 The patch I submitted converts the `go` port to a stub (like the port for
 [browser:trunk/dports/lang/php/Portfile PHP], but much simpler) and adds
 sub-ports for Go 1.4 and Go 1.5, with `go1.4` defined as a build
 dependency for `go1.5`.  It also adds a `go get` command to the build
 phase to include standard tools like `godoc`, `vet`, and `cover` that no
 serious Go developer can live without.

 See also [ticket:49047 ticket 49047], which defines a new `go_select` port
 for easy switching between Go versions.

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Ticket URL: <https://trac.macports.org/ticket/48940#comment:6>
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