[MacPorts] #68020: cargo @0.72.2: buildbot link failure for 10.6/10.8: undefined symbols _renameat, _unlinkat, _linkat

[MacPorts]

#68020: cargo @0.72.2: buildbot link failure for 10.6/10.8: undefined symbols
_renameat, _unlinkat, _linkat
----------------------+---------------------------------
  Reporter:  mascguy  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  cargo    |
----------------------+---------------------------------
Changes (by aiyagari):

 * Attachment "main.log" added.

 Log for 10.9

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Ticket URL: <https://trac.macports.org/ticket/68020>
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