[MacPorts] #60940: libvpx: Support arm64

[MacPorts]

#60940: libvpx: Support arm64
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  dbevans
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  libvpx
------------------------+----------------------
 The libvpx portfile says:

 {{{
 supported_archs     x86_64 i386
 }}}

 Can you investigate adding support for arm64?

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