[MacPorts] #46558: phonon-backend-gstreamer update to 4.8.2 and qt5 support

[MacPorts]

#46558: phonon-backend-gstreamer update to 4.8.2 and qt5 support
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  Reporter:  rjvbertin@…               |      Owner:  macports-tickets@…
      Type:  update                    |     Status:  new
  Priority:  Normal                    |  Milestone:
 Component:  ports                     |    Version:
Resolution:                            |   Keywords:  haspatch
      Port:  phonon-backend-gstreamer  |
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Comment (by springermac@…):

 The latest diff doesn't have the full changes and fails because
 ${destroot}${qt_plugins_dir} doesn't exist during destroot.

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Ticket URL: <https://trac.macports.org/ticket/46558#comment:11>
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