[MacPorts] #64017: add a way to get rdeps of an installed version of a port

[MacPorts]

#64017: add a way to get rdeps of an installed version of a port
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  Reporter:  ballapete    |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:               |
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Changes (by ryandesign):

 * cc: ryandesign (removed)


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Ticket URL: <https://trac.macports.org/ticket/64017#comment:8>
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