[MacPorts] #44048: plplot: fix livecheck

[MacPorts]

#44048: plplot: fix livecheck
---------------------+-----------------------
 Reporter:  mojca@…  |      Owner:  takeshi@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  plplot
---------------------+-----------------------
 {{{
 $ port -v livecheck plplot
 plplot seems to have been updated (port version: 5.10.0, new version:
 5.9.11)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/44048>
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