[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 Ionic):

 Great, thanks!

 That means that I can treat `ppc` as an equivalent to `i386` and `ppc64`
 as an equivalent to `x86_64`.

 Supporting 10.4 on the other hand will get complicated. Do you think it's
 worth the effort?

 I could pass down the build host's `${os.major}` (or something like the
 deployment target, though I'd like to avoid that one because it's not just
 a plain number) and use that to achieve 10.4-compatibility. Would make the
 code a bit more complex, but not by much. For even older systems, building
 will likely fail (for instance if they don't even have the `$UNIX2003`
 stuff).

 I assume that i386 10.4 also only has the "normal" and `$UNIX2003`
 symbols?

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Ticket URL: <https://trac.macports.org/ticket/58935#comment:17>
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