[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:  closed                               
  Priority:  Normal                   |   Milestone:                                       
 Component:  ports                    |     Version:                                       
Resolution:  fixed                    |    Keywords:                                       
      Port:  opencv                   |  
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Changes (by ryandesign@…):

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


Comment:

 I was able to resolve the issues I had with this update; committed in
 r86726.

 The issues that held up the update were:

  * The build failed, but this turned out to be because I had opencv 2.2
 installed and it was using parts of it; I made the port instruct users to
 deactivate old versions before building the new one
  * The install_name of the libraries was wrong; I found the offending
 lines in the CMakeLists.txt files that were overwriting our install_name
 instructions and removed them

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Ticket URL: <https://trac.macports.org/ticket/31818#comment:1>
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