[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:  Ionic
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  mpv      |
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Description changed by dbevans:

Old description:

> 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'
> }}}

New description:

 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'
 }}}

 Built using

 {{{
 macOS 10.14.4 18E226
 Xcode 10.2 10E125
 }}}

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Ticket URL: <https://trac.macports.org/ticket/58242#comment:2>
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