[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@…):

 Replying to [comment:21 ryandesign@…]:
 > s710 fails to build because it cannot find libvpx. I declared libvpx as
 a build dependency of gd2 because it only contains a static library, but
 it turns out "-lvpx" makes its way into gd2's pkgconfig files and gdlib-
 config script, so libvpx should be a library dependency after all.

 Changed libvpx to a library dependency in r109435.

 > pcb fails to build, saying "configure: error: Your gd installation does
 not appear to include gif support." gif support should be there, so this
 needs investigation.

 The most telling difference between the log on my system (where it builds)
 and the buildbot's (where it doesn't) is that the buildbot didn't have
 tiff installed. Looks like gd2 is opportunistically using libtiff, so I
 added an explicit dependency on it in r109444. Not sure if that will help
 with this but I'll kick off a new build on the buildbot to see.

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Ticket URL: <https://trac.macports.org/ticket/39550#comment:22>
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