[MacPorts] #62011: opencv/opencv4: eliminate portfile duplication, via subport

[MacPorts]

#62011: opencv/opencv4: eliminate portfile duplication, via subport
-------------------------+----------------------------
 Reporter:  mascguy      |      Owner:  mascguy
     Type:  enhancement  |     Status:  assigned
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  opencv opencv4
-------------------------+----------------------------
 Now that the two OpenCV-related ports have been brought up to parity,
 there are very few differences between the two. Eliminate the portfile
 duplication, via a subport.

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