[MacPorts] #41868: libgit2 @0.17.0: update to 0.20.0

[MacPorts]

#41868: libgit2 @0.17.0: update to 0.20.0
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  Reporter:  juanrgar@…  |      Owner:  ryandesign@…
      Type:  update      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:  haspatch
      Port:  libgit2     |
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Comment (by ryandesign@…):

 It builds fine on Mavericks, both on my system and on the buildbot.

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Ticket URL: <https://trac.macports.org/ticket/41868#comment:6>
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