[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 Harry1993):

 64-bit ARM macOS and Windows reach Tier 2:

 https://blog.rust-lang.org/2020/12/31/Rust-1.49.0.html

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Ticket URL: <https://trac.macports.org/ticket/60943#comment:10>
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