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

[MacPorts]

#61668: ffmpeg 4.3.1: fails to install on Apple Silicon
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  Reporter:  jpanetta  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:            |
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Comment (by kencu):

 The thing to do for now is to use the non-rust fallback librsvg that we
 use on all the older systems by tweaking this test so that the arm64 macs
 are included:

 <https://github.com/macports/macports-
 ports/blob/0f4f4f445f5784d69cbc0f9abe8c71cd7a5a5b47/graphics/librsvg/Portfile#L58>

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Ticket URL: <https://trac.macports.org/ticket/61668#comment:2>
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