[MacPorts] #52845: mpv: update to 0.22

[MacPorts]

#52845: mpv: update to 0.22
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  Reporter:  iMiKED  |      Owner:  Ionic
      Type:  update  |     Status:  accepted
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  mpv     |
---------------------+----------------------

Comment (by Ionic):

 ... and I'm still updating my VM. It ran into an error upgrading GCC 6, so
 I'll have to clean and restart this.

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Ticket URL: <https://trac.macports.org/ticket/52845#comment:9>
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