[MacPorts] #69522: mpv: Add libmpv

[MacPorts]

#69522: mpv: Add libmpv
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  Reporter:  gabrielzschmitz  |      Owner:  Ionic
      Type:  enhancement      |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.9.1
Resolution:                   |   Keywords:
      Port:  mpv              |
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Comment (by ryandesign):

 Oh, I didn't notice that there is a +libmpv variant.

 A variant is not a good way to provide a library because other ports
 cannot depend on it. Either enable the library always, or better yet make
 it a subport.

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Ticket URL: <https://trac.macports.org/ticket/69522#comment:4>
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