[MacPorts] #52845: mpv 0.21 update

[MacPorts]

#52845: mpv 0.21 update
---------------------+----------------------
  Reporter:  iMiKED  |      Owner:  Ionic
      Type:  update  |     Status:  accepted
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.3.4
Resolution:          |   Keywords:
      Port:  mpv     |
---------------------+----------------------

Comment (by Ionic):

 Updating `mpv` is a really non-trivial task due to the huge patchset. Is
 there any specific reason for 0.21? The only really interesting bugfix is
 a full screen fix on OS X 10.11+.

 I can take a shot at it, but still don't count on it any time too soon.

--
Ticket URL: <https://trac.macports.org/ticket/52845#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS