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

[MacPorts]

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

Comment (by Ionic):

 {{{
 %  clang -dumpmachine
 x86_64-apple-darwin13.4.0
 %  clang -m32 -dumpmachine
 i386-apple-darwin13.4.0
 %  /opt/local/bin/gcc-mp-8 -dumpmachine
 x86_64-apple-darwin13
 %  /opt/local/bin/gcc-mp-8 -m32 -dumpmachine
 x86_64-apple-darwin13
 }}}

 Looks like finding out what target architecture will be generated will be
 difficult with GCC...

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Ticket URL: <https://trac.macports.org/ticket/58935#comment:9>
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