[MacPorts] #49266: R: use compiler portgroup to clean up variants

[MacPorts]

#49266: R: use compiler portgroup to clean up variants
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  Reporter:  sean@…       |      Owner:  kjell.konis@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  R            |
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Comment (by kjell.konis@…):

 This bug is duplicated in #49316. The patch there also makes 2 other
 useful fixes to the Portfile.

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Ticket URL: <https://trac.macports.org/ticket/49266#comment:4>
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