[MacPorts] #72507: proxy_rsync is not taken into account anymore

[MacPorts]

#72507: proxy_rsync is not taken into account anymore
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  Reporter:  pagecp  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.10.7
Resolution:          |   Keywords:
      Port:          |
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Comment (by jmroot):

 As far as I can tell, `RSYNC_PROXY` is correctly set in the environment
 when syncing with rsync in 2.10.7. Could the behaviour of rsync have been
 changed by an OS update?

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Ticket URL: <https://trac.macports.org/ticket/72507#comment:2>
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