[MacPorts] #64017: add a way to get rdeps of an installed version of a port (was: `port rdeps <whatever>` reports faulty dependencies)

[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:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:  port         |
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Changes (by jmroot):

 * keywords:  Monterey =>
 * cc: jmroot (removed)
 * type:  request => enhancement


Comment:

 Let's be honest in the summary; the reported deps are not inaccurate,
 they're just not for the version of the port that you happen to want at
 this moment.

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Ticket URL: <https://trac.macports.org/ticket/64017#comment:6>
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