[MacPorts] #58935: go @1.13: build fails on 10.9 and less

[MacPorts]

#58935: go @1.13: build fails on 10.9 and less
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  Reporter:  kencu   |      Owner:  ci42
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  lion mountainlion
      Port:  go      |
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Comment (by kencu):

 I don't think there would be any issue with you adding the `muniversal` PG
 to your own test build, for some specific work. Or even building it
 yourself as one arch or the other using `supported_arches` in the portfile
 to force it this way and that way for testing.

 But I will admit to trying to keep the legacy support project from getting
 super over-engineered and collapsing under it's own weight :>

 Sometimes, I think it's already getting close to that! There are so many
 nested include files flying around, and #ifdef blockers, that you can
 quite easily lose track of what the H*LL is going on, especially with some
 of that function overriding business...

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Ticket URL: <https://trac.macports.org/ticket/58935#comment:11>
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