[MacPorts] #45334: ledger @ 3.1.0 upgrade

[MacPorts]

#45334: ledger @ 3.1.0 upgrade
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  Reporter:  mgrimes@…  |      Owner:  johnw@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:  haspatch
      Port:  ledger     |
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Comment (by mgrimes@…):

 I've removed the `revision` line. It appears that there is some issue with
 gcc 4.7 that causes a segfault. Seems to work ok with 4.8. I've modified
 the PortFile to reflect. I've also shuffled some dependencies from
 depends_lib to depends_build.

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Ticket URL: <https://trac.macports.org/ticket/45334#comment:2>
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