[MacPorts] #62011: opencv3/opencv4: eliminate portfile duplication via subports; simplify via portgroups; streamline python binding generation

[MacPorts]

#62011: opencv3/opencv4: eliminate portfile duplication via subports; simplify via
portgroups; streamline python binding generation
------------------------------+----------------------
  Reporter:  mascguy          |      Owner:  mascguy
      Type:  enhancement      |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  opencv3 opencv4  |
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Comment (by Christopher Nielsen <mascguy@…>):

 In [changeset:"3d74dc855799921b0ef19ea278dabae4921e873d/macports-ports"
 3d74dc855799921b0ef19ea278dabae4921e873d/macports-ports] (master):
 {{{
 #!ConfigurableCommitTicketReference repository="macports-ports"
 revision="3d74dc855799921b0ef19ea278dabae4921e873d"
 opencv3/opencv4: reduce path copy-paste in configure arguments; simplify
 via cmake portgroup when possible

 See: https://trac.macports.org/ticket/62011
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62011#comment:17>
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