[MacPorts] #64118: go: notes: only display environment variables needed, if not already set by user (was: go @1.17.4: enhancement proposition)

[MacPorts]

#64118: go: notes: only display environment variables needed, if not already set by
user
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  Reporter:  macdeport    |      Owner:  ci42
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:  go           |
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Ticket URL: <https://trac.macports.org/ticket/64118#comment:6>
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