[MacPorts] #31818: opencv: update to 2.3.1a

[MacPorts]

#31818: opencv: update to 2.3.1a
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  Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
      Type:  update                   |      Status:  closed                               
  Priority:  Normal                   |   Milestone:                                       
 Component:  ports                    |     Version:                                       
Resolution:  fixed                    |    Keywords:                                       
      Port:  opencv                   |  
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Comment(by andrew.c.stewart@…):

 So does this mean 2.3.1 is on mac ports now?  Because I only see 2.2 when
 I do a 'port info opencv'

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Ticket URL: <https://trac.macports.org/ticket/31818#comment:4>
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