[MacPorts] #18339: Write compliant FFmpeg dependent ports

[MacPorts]

#18339: Write compliant FFmpeg dependent ports
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 Reporter:  jm@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement   |      Status:  new                                  
 Priority:  Normal        |   Milestone:  Port Enhancements                    
Component:  ports         |     Version:  1.7.0                                
 Keywords:                |        Port:                                       
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 Some packages register FFmpeg dependencies as Ports, not libs. I submit
 several simple patches to solve this issue.

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Ticket URL: <http://trac.macports.org/ticket/18339>
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