[MacPorts] #62699: poco: Add universal variant

[MacPorts]

#62699: poco: Add universal variant
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  Reporter:  ryandesign   |      Owner:  arjanvandervelde
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  poco         |
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Comment (by ryandesign):

 Switching to cmake does indeed allow a universal build with no extra
 effort, so I plan to commit the switch to cmake to resolve this.

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Ticket URL: <https://trac.macports.org/ticket/62699#comment:1>
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