[MacPorts] #31818: opencv: update to 2.3.1

[MacPorts]

#31818: opencv: update to 2.3.1
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  Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
      Type:  update                   |      Status:  reopened                             
  Priority:  Normal                   |   Milestone:                                       
 Component:  ports                    |     Version:                                       
Resolution:                           |    Keywords:                                       
      Port:  opencv                   |  
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Changes (by ryandesign@…):

  * status:  closed => reopened
  * resolution:  fixed =>


Comment:

 Oh great, since I started working on this, they deleted the 2.3.1 tarball
 from sourceforge and uploaded a new 2.3.1a tarball. Let's see how it
 differs...

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Ticket URL: <https://trac.macports.org/ticket/31818#comment:2>
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