[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
---------------------+----------------------
 Reporter:  dbevans  |      Owner:  (none)
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  mpv
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 Apparently mpv is using Swift 3 which is no longer supported in Xcode
 10.2. Build log attached.

 {{{
 :info:build <unknown>:0: error: invalid value '3' in '-swift-version 3'
 :info:build <unknown>:0: note: valid arguments to '-swift-version' are
 '4', '4.2', '5'
 }}}

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