[MacPorts] #54064: port:mlt{, -qt5} : backported upstream patch, OpenCV & SDL tweaks

[MacPorts]

#54064: port:mlt{,-qt5} : backported upstream patch, OpenCV & SDL tweaks
--------------------------+----------------------
  Reporter:  RJVB         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  mlt mlt-qt5  |
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Comment (by RJVB):

 I think Dan can handle those points if he agrees.

 Me I think that adding the revision statement on the same line as the
 version is the best and simplest protection against forgetting to remove
 it; it also reads more in line with how the port effective version is
 shown elsewhere. Both alternatives are valid syntax so I don't see why we
 have to be splitting hairs over this.

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Ticket URL: <https://trac.macports.org/ticket/54064#comment:3>
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