[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 ryandesign@…):

 If gnuplot had built successfully and simply omitted gd2 support when it
 discovered that png support wasn't available, then it would have needed
 another revbump. But it failed to build, so it doesn't. If binary packages
 were available, then I would have to tell the buildbot to try the build
 again.

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Ticket URL: <https://trac.macports.org/ticket/39550#comment:19>
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