[MacPorts] #58646: gcc8 @8.3.0_4 +universal: does not build/install universal libraries

[MacPorts]

#58646: gcc8 @8.3.0_4 +universal: does not build/install universal libraries
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  Reporter:  Ionic      |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  gcc8 gcc9  |
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Comment (by Ionic):

 That doesn't seem to work. I removed `supported_archs`, added an empty-
 block universal variant to libgcc, touched the OpenBLAS portfile for good
 measure and regenerated the PortIndex, but base doesn't want to upgrade
 either libgcc or libgcc9.

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Ticket URL: <https://trac.macports.org/ticket/58646#comment:24>
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