[MacPorts] #68963: mpv @0.37.0 is broken on most of the systems

[MacPorts]

#68963: mpv @0.37.0 is broken on most of the systems
-------------------------+-------------------------------------------------
  Reporter:              |      Owner:  i0ntempest
  barracuda156           |
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  bigsur, mojave, highsierra, sierra,
                         |  elcapitan, yosemite, mavericks, mountainlion,
      Port:  mpv         |  lion, snowleopard, leopard
-------------------------+-------------------------------------------------

Comment (by i0ntempest):

 libplacebo is needed no matter what. +x11 is really an old remnant, if we
 do decide to split a legacy port out of current portfile it will be
 removed along with other stuff that used to work on old systems.

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Ticket URL: <https://trac.macports.org/ticket/68963#comment:5>
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