[MacPorts] #59451: ffmpeg @4.2.1_1+gpl2: unable to upgrade to 4.2.1_2

[MacPorts]

#59451: ffmpeg @4.2.1_1+gpl2: unable to upgrade to 4.2.1_2
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  Reporter:  thomasrussellmurphy  |      Owner:  dbevans
      Type:  defect               |     Status:  assigned
  Priority:  Normal               |  Milestone:
 Component:  ports                |    Version:
Resolution:                       |   Keywords:
      Port:  ffmpeg               |
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Comment (by jmroot):

 Please also attach the `ffbuild/config.log` file which should be inside
 the path given by `port work ffmpeg`.

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Ticket URL: <https://trac.macports.org/ticket/59451#comment:3>
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