[MacPorts] #26476: mlt: update to upstream version 0.5.10

[MacPorts]

#26476: mlt: update to upstream version 0.5.10
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 Reporter:  dan@…                |       Owner:  ryandesign@…           
     Type:  update               |      Status:  assigned               
 Priority:  Normal               |   Milestone:                         
Component:  ports                |     Version:                         
 Keywords:  haspatch maintainer  |        Port:  mlt                    
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Comment(by ryandesign@…):

 What was the reason, by the way, that we're downloading from git instead
 of from the [http://sourceforge.net/projects/mlt/files/ available
 distfiles]?

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Ticket URL: <https://trac.macports.org/ticket/26476#comment:10>
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