[MacPorts] #39550: gd2: update to 2.1.0

[MacPorts]

#39550: gd2: update to 2.1.0
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  Reporter:  mojca@…  |      Owner:  ryandesign@…
      Type:  update   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  gd2      |
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Comment (by mojca@…):

 Gnuplot isn't shipping as a binary package, so that one probably doesn't
 need a revbump. Thanks for fixing this so quickly.

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Ticket URL: <https://trac.macports.org/ticket/39550#comment:18>
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