[MacPorts] #63069: vtk: migrate from python variants to subports

[MacPorts]

#63069: vtk: migrate from python variants to subports
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  Reporter:  mascguy      |      Owner:  stromnov
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.2
Resolution:               |   Keywords:
      Port:  vtk          |
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Comment (by mascguy):

 Replying to [comment:12 Dave-Allured]:
 > Would someone kindly give me a couple of tips on how to start for
 subports?  I will give this a try.  BTW, update 9.4.0 for VTK is imminent.

 We have a few ports where we migrated from variants to subports, such as
 `opencv3` and `opencv4`. You can use those as rough examples, to get an
 overall idea.

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Ticket URL: <https://trac.macports.org/ticket/63069#comment:14>
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