[MacPorts] #60944: qt5: Support arm64

[MacPorts]

#60944: qt5: Support arm64
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  Reporter:  ryandesign   |      Owner:  MarcusCalhoun-Lopez
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  qt5          |
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Comment (by michaelld):

 Need to update to qt 5.15.1 ... then add "arm64" to that line in the PG.
 At least some of the components build without other modification.

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Ticket URL: <https://trac.macports.org/ticket/60944#comment:1>
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