[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 Dave-Allured):

 Replying to [comment:17 mascguy]:
 > Well, no... I wasn't volunteering to take this on. Rather, the goal was
 to provide you with a starting point, and help guide you via your own PR.

 Okay, that works.  Thanks for the help.

 FYI I am also considering splitting the VTK port into core and wrappers,
 of which python is one.  This might simplify the python subports.  I am
 also slowly migrating from bundled to external third party libraries.

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Ticket URL: <https://trac.macports.org/ticket/63069#comment:18>
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