[MacPorts] #33542: unixODBC: update to 2.3.1 and fix livecheck

[MacPorts]

#33542: unixODBC: update to 2.3.1 and fix livecheck
-------------------------------------+--------------------------------------
 Reporter:  ryandesign@…             |       Owner:  simon@…            
     Type:  update                   |      Status:  new                
 Priority:  Normal                   |   Milestone:                     
Component:  ports                    |     Version:                     
 Keywords:                           |        Port:  unixODBC           
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 unixODBC should probably be updated to 2.3.1 which was released November
 2011.

 The livecheck should also be fixed:

 {{{
 $ port livecheck unixodbc
 Error: cannot check if unixodbc was updated (regex didn't match)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/33542>
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