[MacPorts] #52149: ffmpeg @3.1.2: update to 3.1.3

[MacPorts]

#52149: ffmpeg @3.1.2: update to 3.1.3
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 Reporter:  l2dy@…  |      Owner:  macports-tickets@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  ffmpeg
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Ticket URL: <https://trac.macports.org/ticket/52149>
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