[MacPorts] #42238: LibreCAD: add openmaintainer; use qmake portgroup (was: Updated Portfile per recommendation on ticket #42235)

[MacPorts]

#42238: LibreCAD: add openmaintainer; use qmake portgroup
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  Reporter:  librecad@…   |      Owner:  macports-tickets@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch maintainer
      Port:  LibreCAD     |
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Ticket URL: <https://trac.macports.org/ticket/42238#comment:2>
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