[MacPorts] #69837: Redesign R ports/portgroup so that a revbump is not needed after major R updates

[MacPorts]

#69837: Redesign R ports/portgroup so that a revbump is not needed after major R
updates
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  Reporter:  ryandesign  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  R           |
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Comment (by barracuda156):

 Replying to [ticket:69837 ryandesign]:

 So this is controlled by `FW_VERSION` in configure script of `R`. I will
 sort this out so that we do not face this issue again.

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Ticket URL: <https://trac.macports.org/ticket/69837#comment:4>
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