[MacPorts] #44567: Upgrade mscgen to 0.2

[MacPorts]

#44567: Upgrade mscgen to 0.2
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  Reporter:  charles.choi@…  |      Owner:  macports-tickets@…
      Type:  update          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.3.1
Resolution:                  |   Keywords:
      Port:  mscgen          |
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Comment (by charles.choi@…):

 Link to mscgen

 http://www.mcternan.me.uk/mscgen/

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Ticket URL: <https://trac.macports.org/ticket/44567#comment:1>
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