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

[MacPorts]

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

 * status:  assigned => closed
 * resolution:   => fixed


Comment:

 Committed in r115002 with a few other changes:

  * removed "github.tarball_from downloads"
  * added dependencies on libiconv, libssh2, and openssl because it does
 link with them
  * changed the build.dir variable to be based on the configure.dir
 variable and also used configure.dir in the post-extract block

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Ticket URL: <https://trac.macports.org/ticket/41868#comment:3>
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