[MacPorts] #56281: MacOS 10.13.4 : Cargo port build failure about SSL and github

[MacPorts]

#56281: MacOS 10.13.4 : Cargo port build failure about SSL and github
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  Reporter:  cgilles  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:           |
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Comment (by ryandesign):

 It is a bug that cargo is trying to do any fetching at all outside of the
 fetch phase. See #56195. Fixing that bug is all we need to do to solve
 this problem.

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Ticket URL: <https://trac.macports.org/ticket/56281#comment:2>
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