[MacPorts] #60943: rust, cargo: Support arm64

[MacPorts]

#60943: rust, cargo: Support arm64
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  Reporter:  ryandesign   |      Owner:  g5pw
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  rust cargo   |
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Comment (by kencu):

 Now it appears we will need to re-enable all that universal building
 capability that was removed here:

 <https://github.com/macports/macports-
 ports/commit/8aa429ba73845ced50d6e629bdfc681f010bcfaf#diff-
 439b549b4a6528e0f92597b22102ec01f739d5589aba1ea8543819cc7afb45d6>

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Ticket URL: <https://trac.macports.org/ticket/60943#comment:11>
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