[MacPorts] #63467: opencv4: Add a universal variant

[MacPorts]

#63467: opencv4: Add a universal variant
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  Reporter:  MarkCallow   |      Owner:  stromnov
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  opencv4      |
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Comment (by hmeine):

 FWIW, I did *not* have the gmake problem (i.e., gmake @4.3_0+universal was
 implicitly built and installed as a dependency just fine), but jemalloc
 does not install due to a problem with two conflicting -config scripts
 (#65213).

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Ticket URL: <https://trac.macports.org/ticket/63467#comment:8>
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