[MacPorts] #38419: gnuplot: update to 4.6.2

[MacPorts]

#38419: gnuplot: update to 4.6.2
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 Reporter:  mojca@…   |      Owner:  mojca@…
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.1.3
 Keywords:  haspatch  |       Port:  gnuplot
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 I'm attaching a patch for upgrading gnuplot to 4.6.2. The patch also
 addresses:
   * #36135 (enhancement to support emacs-app)
   * #38321 (add variant for old bitmap formats)
   * #38365 (remove +tutorial option and dependency on texlive)
 I would be grateful for any kind of feedback before committing this, in
 particular about names in #38321.

 (I closed #35879 for now because the only person who reported the problem
 never responded to the patch. I'm willing to reopen and fix it, but only
 if someone is willing to test.)

 Disclaimer: I'm currently experiencing some problems on my machine
 (outdated and slightly broken macports) and it might take a while until
 all packages get up to date, so I didn't test the patch yet. I plan to
 test it tomorrow, but the sooner I upload the patch, the sooner other
 users can try it out and provide feedback.

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Ticket URL: <https://trac.macports.org/ticket/38419>
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