[MacPorts] #39228: R +cairo requires +x11 variant unnecessarily in some cases

[MacPorts]

#39228: R +cairo requires +x11 variant unnecessarily in some cases
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  Reporter:  mmoll@…  |      Owner:  kjell.konis@…
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.1.3
Resolution:           |   Keywords:
      Port:  R        |
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Comment (by mmoll@…):

 Quartz is used for graphical windows. See attached screenshot.

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Ticket URL: <https://trac.macports.org/ticket/39228#comment:3>
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