[MacPorts] #61668: ffmpeg 4.3.1: fails to install on Apple Silicon

[MacPorts]

#61668: ffmpeg 4.3.1: fails to install on Apple Silicon
-----------------------+----------------------
  Reporter:  jpanetta  |      Owner:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  ffmpeg    |
-----------------------+----------------------

Comment (by kencu):

 ffmpeg installs fine if you delete {{{libvpx}}} out of the {{{ffmpeg}}}
 portfile:
 {{{
 % port -v installed ffmpeg
 The following ports are currently installed:
   ffmpeg @4.3.1_0+gpl2-x11 (active) platform='darwin 20' archs='arm64'
 date='2020-12-20T00:35:30-0500'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61668#comment:16>
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