[MacPorts] #56417: transcode @1.1.7_21 fails to build with ffmpeg 4

[MacPorts]

#56417: transcode @1.1.7_21 fails to build with ffmpeg 4
------------------------+--------------------
  Reporter:  tehcog     |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.3
Resolution:             |   Keywords:
      Port:  transcode  |
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Changes (by ajdudman):

 * Attachment "Portfile" added.

 This Portfile patches transcode for ffmpeg 4 and as needed ImageMagick 7.

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Ticket URL: <https://trac.macports.org/ticket/56417>
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