[MacPorts] #26498: Update mscgen to version 0.17

[MacPorts]

#26498: Update mscgen to version 0.17
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 Reporter:  tvb377@…       |       Owner:  macports-tickets@…                   
     Type:  update         |      Status:  new                                  
 Priority:  Normal         |   Milestone:                                       
Component:  ports          |     Version:  1.9.1                                
 Keywords:                 |        Port:  mscgen                               
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 This patch updates the Portfile for mscgen to build version 0.18

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Ticket URL: <https://trac.macports.org/ticket/26498>
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