[MacPorts] #64775: xar @1.8.0.452: No longer supports extracting to stdout

[MacPorts]

#64775: xar @1.8.0.452: No longer supports extracting to stdout
-------------------------+-------------------------
  Reporter:  ryandesign  |      Owner:  Schamschula
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:  haspatch
      Port:  xar         |
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Comment (by ryandesign):

 Great! This functionality is used in the
 [https://ports.macports.org/port/MacOSX10.12.sdk MacOSX10.12.sdk port] and
 upcoming newer SDK ports.

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Ticket URL: <https://trac.macports.org/ticket/64775#comment:12>
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