[MacPorts] #71904: gdal @3.10.1: mention +kea variant creating a circular dependency in the variant description

[MacPorts]

#71904: gdal @3.10.1: mention +kea variant creating a circular dependency in the
variant description
--------------------------+--------------------
  Reporter:  cooljeanius  |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.10.5
Resolution:               |   Keywords:
      Port:  gdal         |
--------------------------+--------------------

Comment (by nilason):

 Ideally, it should be implemented as gdal subport: {{{gdal-kea}}}. I’ll
 see if that is feasible.

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Ticket URL: <https://trac.macports.org/ticket/71904#comment:2>
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