[MacPorts] #58289: vtk5: Remove obsolete port

[MacPorts]

#58289: vtk5: Remove obsolete port
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  Reporter:  mf2k    |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  vtk5    |
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Comment (by ctreleaven):

 vtk5 was used for libpcl until last year.  I haven't searched for any
 other uses.  Perhaps that was the last remaining one.

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Ticket URL: <https://trac.macports.org/ticket/58289#comment:1>
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