[MacPorts] #43738: gnuplot: upgrade to 5.0

[MacPorts]

#43738: gnuplot: upgrade to 5.0
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  Reporter:  mojca@…  |      Owner:  mojca@…
      Type:  update   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  haspatch
      Port:  gnuplot  |
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Comment (by mojca@…):

 I attached a diff with an upgrade to version 5.0. A subport for version
 4.6.6 is also included. Please test and provide feedback.

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Ticket URL: <https://trac.macports.org/ticket/43738#comment:24>
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