[MacPorts] #23962: Update mscgen to version 0.17

[MacPorts]

#23962: Update mscgen to version 0.17
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 Reporter:  tvb377@…       |       Owner:  macports-tickets@…                   
     Type:  update         |      Status:  new                                  
 Priority:  Normal         |   Milestone:  MacPorts 1.8.3                       
Component:  ports          |     Version:  1.8.2                                
 Keywords:                 |        Port:                                       
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 This patch updates the Portfile for mscgen to build version 0.17.

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Ticket URL: <http://trac.macports.org/ticket/23962>
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