[MacPorts] #52574: cargo: update to version 0.13.0

[MacPorts]

#52574: cargo: update to version 0.13.0
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  Reporter:  raimue@…  |      Owner:  sean@…
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:  haspatch
      Port:  cargo     |
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Comment (by g5pw@…):

 Yes, please, hold on a bit. There are some issues with building Rust 1.12
 on Mac OS X 10.11

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Ticket URL: <https://trac.macports.org/ticket/52574#comment:2>
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