[MacPorts] #23908: Update weka to 3.6.2

[MacPorts]

#23908: Update weka to 3.6.2
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 Reporter:  singingwolfboy@…             |       Owner:  mnick@…           
     Type:  update                       |      Status:  new               
 Priority:  Normal                       |   Milestone:                    
Component:  ports                        |     Version:  1.8.2             
 Keywords:                               |        Port:  weka              
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 Weka is now version 3.6.2. I've created a diff that the maintainer can use
 to update the Portfile. I also added a new variable `${dash_vers}` so that
 for simple version bumps, the maintainer only has to modify one line of
 the portfile.

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Ticket URL: <http://trac.macports.org/ticket/23908>
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