[MacPorts] #63694: mpv build fails: fatal error encountered while reading from module 'Foundation'

[MacPorts]

#63694: mpv build fails: fatal error encountered while reading from module
'Foundation'
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  Reporter:  ShadSterling  |      Owner:  i0ntempest
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:
      Port:  mpv           |
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Comment (by i0ntempest):

 Unfortunately I'm not skilled enough to debug swift stuff, especially if
 you have mismatching Xcode and OS version.

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Ticket URL: <https://trac.macports.org/ticket/63694#comment:11>
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