[MacPorts] #53445: port:mlt/mlt-qt5 fixes

[MacPorts]

#53445: port:mlt/mlt-qt5 fixes
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  Reporter:  RJVB         |      Owner:  ddennedy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch maintainer
      Port:  mlt          |
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Comment (by RJVB):

 I actually had a newer version lying around, introducing 2 patches:

 - a cherry-picked upstream patch fixing a crash-on-exit in certain client
 applications (kdenlive)

 - a variant with patch allowing to build without SDL support, to avoid
 runtime conflicts with SDL2 (or at least the corresponding warnings).

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Ticket URL: <https://trac.macports.org/ticket/53445#comment:6>
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