[MacPorts] #24030: mlt: update to upstream version 0.5.2

[MacPorts]

#24030: mlt: update to upstream version 0.5.2
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 Reporter:  dan@…            |       Owner:  macports-tickets@…                   
     Type:  update           |      Status:  new                                  
 Priority:  Normal           |   Milestone:                                       
Component:  ports            |     Version:  1.8.2                                
 Keywords:                   |        Port:  mlt                                  
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 This also addresses ticket #23878 by explicitly depending on ffmpeg-devel.
 Plain ffmpeg is too old for practical usage of MLT.

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Ticket URL: <http://trac.macports.org/ticket/24030>
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