[MacPorts] #62337: go @1.16 fails to build on el capitan

[MacPorts]

#62337: go @1.16 fails to build on el capitan
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  Reporter:  jrquinello  |      Owner:  ci42
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:
      Port:  go          |
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Comment (by herbygillot):

 Hello @jrquinello, can you run `sudo port selfupdate`, then try to
 reinstall `go` and verify whether or not this is still an issue?

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Ticket URL: <https://trac.macports.org/ticket/62337#comment:2>
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