[MacPorts] #60874: MPlayer: Update to 1.4

[MacPorts]

#60874: MPlayer: Update to 1.4
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  jeremyhu
     Type:  update      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  MPlayer
------------------------+----------------------
 The MPlayer port is at version 1.3.0.
 [http://www.mplayerhq.hu/design7/news.html 1.4 was released in 2019].
 [https://lists.macports.org/pipermail/macports-users/2020-July/048594.html
 A user has requested that the port be updated].

 You may not have noticed the availability of this update because the port
 disables livecheck. It should be enabled so that future updates are not
 overlooked.

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Ticket URL: <https://trac.macports.org/ticket/60874>
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