[MacPorts] #58242: mpv @0.29.1_4: build fails with macOS 10.14.4 Xcode 10.2

[MacPorts]

#58242: mpv @0.29.1_4: build fails with macOS 10.14.4 Xcode 10.2
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  Reporter:  dbevans  |      Owner:  Ionic
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  mpv      |
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Comment (by yan12125):

 mpv 0.30 is out and should have fixed build issues on Xcode 10.2 or newer.

 https://github.com/mpv-player/mpv/releases/tag/v0.30.0

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Ticket URL: <https://trac.macports.org/ticket/58242#comment:9>
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