[MacPorts] #43781: json-c @0.9: update to 0.12

[MacPorts]

#43781: json-c @0.9: update to 0.12
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  Reporter:  mister.jannick@…  |      Owner:  devans@…
      Type:  update            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:  haspatch
      Port:  json-c            |
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Comment (by mister.jannick@…):

 I've uploaded a new Portfile. For the dependent ports, do I have to add
 something to the port file?

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Ticket URL: <https://trac.macports.org/ticket/43781#comment:3>
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