[MacPorts] #37035: plplot: change no_x11 variant to x11 variant

[MacPorts]

#37035: plplot: change no_x11 variant to x11 variant
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 Reporter:  ryandesign@…  |      Owner:  takeshi@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  plplot
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 The no_x11 variant should be changed to an x11 variant on by default, as
 we've done in other ports.

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Ticket URL: <https://trac.macports.org/ticket/37035>
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