[MacPorts] #29972: ffmpeg: update to 0.7.1 or 0.8

[MacPorts]

#29972: ffmpeg: update to 0.7.1 or 0.8
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  Reporter:  ryandesign@…             |       Owner:  devans@…           
      Type:  update                   |      Status:  closed             
  Priority:  Normal                   |   Milestone:                     
 Component:  ports                    |     Version:                     
Resolution:  fixed                    |    Keywords:                     
      Port:  ffmpeg                   |  
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Comment(by jeremyhu@…):

 ffmpeg-devel is on master which is the newer API/ABI ... in case you want
 pain, you can pull that in... most ports still need to be updated to use
 the new API (hence why I bumped ffmpeg to fix clang building)

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Ticket URL: <https://trac.macports.org/ticket/29972#comment:2>
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