[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:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  plplot        |
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Comment (by takeshi@…):

 The x11 variant turns xcairo, xfig, xwin ON. I excluded tk from x11
 because tk could be quartz. It could build x11 tk. I considered including
 tk in x11, but that may limit the use of aqua tk. I thought it would be
 better to have x11 tk even if -x11 is specified. I will see if there is a
 better option.

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Ticket URL: <https://trac.macports.org/ticket/37035#comment:3>
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