[MacPorts] #61647: mpv build fails on Mojave

[MacPorts]

#61647: mpv build fails on Mojave
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  Reporter:  ShadSterling  |      Owner:  Ionic
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.4
Resolution:                |   Keywords:
      Port:  mpv           |
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Comment (by mimeiners):

 Same problems during upgrade on macOS 10.14.6 with Xcode 11.2.1.
 Upgrade with Xcode 10.3 worked for me.

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Ticket URL: <https://trac.macports.org/ticket/61647#comment:4>
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