[MacPorts] #56934: ImageMagick depends on libav, libav not provided

[MacPorts]

#56934: ImageMagick depends on libav, libav not provided
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  Reporter:  mexon        |      Owner:  ryandesign
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ImageMagick  |
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Comment (by mf2k):

 +1 on at least adding a ffmpeg variant to ImageMagick. Although I think
 the dependency and support should just be added always.

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Ticket URL: <https://trac.macports.org/ticket/56934#comment:2>
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