[MacPorts] #25447: Update ffmpeg to 0.6

[MacPorts]

#25447: Update ffmpeg to 0.6
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 Reporter:  ocroquette@…        |       Owner:  devans@…           
     Type:  update              |      Status:  new                
 Priority:  Normal              |   Milestone:                     
Component:  ports               |     Version:                     
 Keywords:                      |        Port:  ffmpeg             
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Comment(by manphiz@…):

 When ticket #25055 is solved, ffmpeg can be configured to build with
 libvpx support, aka vp8/webm.  Proposed patch is attached, which adds a
 variant for vpx.

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Ticket URL: <http://trac.macports.org/ticket/25447#comment:3>
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