[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 azakkerman):

 master branch of libvpx has support for arm64 macOS 11, however, it has
 not been tagged with a new version. Presumably, we can just pull a
 specific revision instead of using v1.9.0 to get arm64 build working...

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Ticket URL: <https://trac.macports.org/ticket/60940#comment:5>
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