[MacPorts] #58701: mpv @0.29.1_5 build fail on macOS 10.14.5

[MacPorts]

#58701: mpv @0.29.1_5 build fail on macOS 10.14.5
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 Reporter:  i0ntempest  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.5.4
 Keywords:              |       Port:  mpv
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 Build log attached.

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Ticket URL: <https://trac.macports.org/ticket/58701>
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