[MacPorts] #40304: R port bug fix + enhancements

[MacPorts]

#40304: R port bug fix + enhancements
---------------------------------+--------------------------------
 Reporter:  kjell.konis@…        |      Owner:  macports-tickets@…
     Type:  defect               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.0
 Keywords:  haspatch,maintainer  |       Port:  R
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 Attached diff
 1) disables openmp support since it doesn't work anymore (this is the bug
 fix)
 2) uses the active_variants port group to insure that cairo, pango and tk
 have x11 enabled
 3) gives the fortran compiler variants more accurate names
 4) updates the cario variant description to explain why the cairo variant
 requires x11

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Ticket URL: <https://trac.macports.org/ticket/40304>
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