[MacPorts] #60940: libvpx: Support arm64

[MacPorts]

#60940: libvpx: Support arm64
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  Reporter:  ryandesign  |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  libvpx      |
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Comment (by mascguy):

 Since ffmpeg depends on this port, lack of ARM64 support is blocking
 oodles of downstream ports.

 I took a quick look at the PR, and it looks very close. Does anyone have
 the bandwidth to push this into the end-zone?

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Ticket URL: <https://trac.macports.org/ticket/60940#comment:11>
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