[MacPorts] #63333: cargo @0.54.0_1 fails to build some crates on 10.9

[MacPorts]

#63333: cargo @0.54.0_1 fails to build some crates on 10.9
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  Reporter:  fhgwright                  |      Owner:  cjones051073
      Type:  defect                     |     Status:  assigned
  Priority:  Normal                     |  Milestone:
 Component:  ports                      |    Version:  2.7.1
Resolution:                             |   Keywords:
      Port:  cargo, rust-compiler-wrap  |
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Comment (by cjones051073):

 This is not really  an issue with the compiler wrapper. It is known that
 not all cargo based builds are fixed by the legacy support PG.

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Ticket URL: <https://trac.macports.org/ticket/63333#comment:2>
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