[MacPorts] #44337: R @3.1.0: upgrade to 3.1.1, cairo variant no longer requires X11

[MacPorts]

#44337: R @3.1.0: upgrade to 3.1.1, cairo variant no longer requires X11
---------------------------------+--------------------------------
 Reporter:  kjell.konis@…        |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.1
 Keywords:  haspatch maintainer  |       Port:  R
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 Attached patch updates R to version 3.1.1 and removes the cairo variant
 dependency on the x11 variant.

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Ticket URL: <https://trac.macports.org/ticket/44337>
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