[MacPorts] #39397: gtkmm @2.24.3 (and deps): change active variants usage

[MacPorts]

#39397: gtkmm @2.24.3 (and deps): change active variants usage
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  Reporter:  egall@…                |      Owner:  macports-tickets@…
      Type:  defect                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.1.3
Resolution:                         |   Keywords:
      Port:  gtkmm pangomm cairomm  |
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Comment (by egall@…):

 Also this is split off from #39320

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Ticket URL: <https://trac.macports.org/ticket/39397#comment:3>
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