[MacPorts] #67625: ffmpeg-devel should perhaps be updated to v. 5

[MacPorts]

#67625: ffmpeg-devel should perhaps be updated to v. 5
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 Reporter:  barracuda156  |      Owner:  mascguy
     Type:  update        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  ffmpeg, ffmpeg-devel
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 Currently it mirrors `ffmpeg`, which serves no purpose.

 We also should disable `rav1e` on 10.6 when building for `ppc`, since
 there is no Rust for it.

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Ticket URL: <https://trac.macports.org/ticket/67625>
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