[MacPorts] #58138: go @1.12 fails to build on mavericks

[MacPorts]

#58138: go @1.12 fails to build on mavericks
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  Reporter:  tehcog  |      Owner:  ci42
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.5.4
Resolution:          |   Keywords:
      Port:  go      |
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Changes (by Ionic):

 * Attachment "go.patch" added.

 Suggested build fix for older platforms. Maintainer, please review. I'll
 push it myself, probably within the next few days.

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Ticket URL: <https://trac.macports.org/ticket/58138>
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