[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 springermac@…):

 I fixed this in the process of trying to build the phonon gstreamer
 backend so trying to build it without this patch should fail and with this
 patch should succeed.

 The only thing is that I would like is to fix this in the cmake files
 before phonon is built so the generated files are correct instead of
 trying to patch them after they are made and run the risk of possibly not
 taking into account a user's setup. I would try and fix the original cmake
 files but I don't have enough experience with cmake to do that.

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Ticket URL: <https://trac.macports.org/ticket/44351#comment:8>
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