[MacPorts] #24190: Coin: update to 3.1.3

[MacPorts]

#24190: Coin: update to 3.1.3
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 Reporter:  ryandesign@…             |       Owner:  css@…           
     Type:  update                   |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:                  
 Keywords:                           |        Port:  Coin            
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Comment(by ryandesign@…):

 A simple [attachment:Coin-3.1.3.diff version and checksum update] seems to
 work, though consider also fixing #24191 at the same time.

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Ticket URL: <http://trac.macports.org/ticket/24190#comment:1>
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