[MacPorts] #62027: mythtv.28 fails to build on Big Sur 11.1 with Apple silicon

[MacPorts]

#62027: mythtv.28 fails to build on Big Sur 11.1 with Apple silicon
------------------------+--------------------------
  Reporter:  dfleck     |      Owner:  ctreleaven
      Type:  defect     |     Status:  accepted
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  bigsur arm64
      Port:  mythtv.28  |
------------------------+--------------------------

Comment (by dfleck):

 Modifying the Portfiles as suggested results in a different error:

 {{{
 Error: Cannot install mythtv.28 for the arch 'arm64' because
 Error: its dependency qt5-qtbase only supports the arch 'x86_64'.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62027#comment:4>
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