[MacPorts] #36849: ffmpeg: fix dependencies, add dc1394 variant

[MacPorts]

#36849: ffmpeg: fix dependencies, add dc1394 variant
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 Reporter:  frederic.devernay@…  |      Owner:  macports-tickets@…
     Type:  enhancement          |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.1.2
 Keywords:                       |       Port:  ffmpeg
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 ffmpeg should depend on fontconfig:
 [0.11 relnotes] - drawtext video filter: fontconfig support

 ffmpeg should not depend on dirac:
 [0.9 relnotes] native dirac decoder

 also add dc1394 variant (requires a patch, because libraw1394 is not
 required and does only exist on linux)

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Ticket URL: <https://trac.macports.org/ticket/36849>
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