[MacPorts] #45302: mpv: update to 0.6.0

[MacPorts]

#45302: mpv: update to 0.6.0
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  Reporter:  marek.krolikowski@…  |      Owner:  ionic@…
      Type:  update               |     Status:  new
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:  2.3.1
Resolution:                       |   Keywords:  haspatch
      Port:  mpv                  |
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Comment (by ionic@…):

 Basically it not building on SL. #44662

 Well, I do not like building a self-contained version, because it creates
 duplicates of libraries which are not updated when the base package is
 updated (think `ffmpeg`) and furthermore makes both the binary in
 `${prefix}`/bin and `${applications_path}`/mpv.app behave differently, if
 system packages change, but mpv is not rebuilt.

 Thus I refrained from bundling libraries when crafting the mpv Portfile
 '''on purpose'''.

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Ticket URL: <https://trac.macports.org/ticket/45302#comment:7>
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