[MacPorts] #66931: libgit2 @1.5.1: fails to build on arm64

[MacPorts]

#66931: libgit2 @1.5.1: fails to build on arm64
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  Reporter:  jrabinow  |      Owner:  dbevans
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.8.1
Resolution:            |   Keywords:
      Port:  libgit2   |
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Comment (by bnoctis):

 This hit me a few times, `configure.ldflags_append -liconv` solved it.

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Ticket URL: <https://trac.macports.org/ticket/66931#comment:6>
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