[MacPorts] #63932: gcc11 offers a universal variant on macOS 10.15 where universal is not possible

[MacPorts]

#63932: gcc11 offers a universal variant on macOS 10.15 where universal is not
possible
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  catalina
      Port:  gcc11       |
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Comment (by jmroot):

 I think this is due to directly setting `configure.universal_archs`. So it
 should just not do that when universal is not possible.

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Ticket URL: <https://trac.macports.org/ticket/63932#comment:1>
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