[MacPorts] #26515: Fix transcode to properly link in libmpeg2

[MacPorts]

#26515: Fix transcode to properly link in libmpeg2
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 Reporter:  danielb@…              |       Owner:  macports-tickets@…                   
     Type:  defect                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  1.9.1                                
 Keywords:                         |        Port:  transcode                            
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 This patch properly links in libmpeg2 and libmpeg2convert so that we have
 a functional transcode binary that works with other software like tovid.

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Ticket URL: <https://trac.macports.org/ticket/26515>
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