[MacPorts] #39818: pgplot: add +x11 variant

[MacPorts]

#39818: pgplot: add +x11 variant
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 Reporter:  mojca@…      |      Owner:  mcalhoun@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  pgplot
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 I'm attaching a patch for adding {{{+x11}}} variant to pgplot according to
 ticket #39383. Please do some additional review/testing and commit if
 appropriate.

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Ticket URL: <https://trac.macports.org/ticket/39818>
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