[MacPorts] #36850: ffmpeg: fix universal build when architectures can't be run

[MacPorts]

#36850: ffmpeg: fix universal build when architectures can't be run
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 Reporter:  frederic.devernay@…  |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.1.2
 Keywords:                       |       Port:  ffmpeg
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 this fixes the universal build on PPC and on Intel Core (not Core 2)
 processors.
 I grabbed the code from the icu Portfile

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Ticket URL: <https://trac.macports.org/ticket/36850>
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