[MacPorts] #44351: Fix phonon cmake install

[MacPorts]

#44351: Fix phonon cmake install
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  Reporter:  springermac@…  |      Owner:  michaelld@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:
Resolution:                 |   Keywords:  haspatch
      Port:  phonon         |
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Comment (by michaelld@…):

 Can you provide whatever info I need to know to recreate your building of
 the gstreamer backend, so that I can test/verify the changes?  Once I know
 what to do, I will try to fix in the source. But, without knowing what to
 do it's a little difficult to fix.

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Ticket URL: <https://trac.macports.org/ticket/44351#comment:9>
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