[MacPorts] #57133: Don't offer universal variant when multiple architectures aren't supported

[MacPorts]

#57133: Don't offer universal variant when multiple architectures aren't supported
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:  MacPorts 2.6.0
 Component:  base        |    Version:  2.5.99
Resolution:              |   Keywords:  mojave
      Port:              |
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Comment (by jmroot):

 Dupe of #29786?

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Ticket URL: <https://trac.macports.org/ticket/57133#comment:1>
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