[MacPorts] #72272: clonefile() and family in legacy-support and reasons to block Rust to 1.78.0 on OS <= 10.12

[MacPorts]

#72272: clonefile() and family in legacy-support and reasons to block Rust to
1.78.0 on OS <= 10.12
-----------------------------------+--------------------
  Reporter:  RJVB                  |      Owner:  (none)
      Type:  enhancement           |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:
Resolution:                        |   Keywords:
      Port:  legacy-support, rust  |
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Comment (by fhgwright):

 I'll take a look, but not right away.  Note that, even if the
 implementation is trivial, there needs to be an accompanying test, and the
 test needs to pass on all OS versions, not just ones using `legacy-
 support`.

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Ticket URL: <https://trac.macports.org/ticket/72272#comment:2>
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