[MacPorts] #56334: ffmpeg @3.4.2: update to 4.0

[MacPorts]

#56334: ffmpeg @3.4.2: update to 4.0
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 Reporter:  l2dy    |      Owner:  dbevans
     Type:  update  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  ffmpeg
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Ticket URL: <https://trac.macports.org/ticket/56334>
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