[MacPorts] #13318: update nip2 port

[MacPorts]

#13318: update nip2 port
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 Reporter:  jcupitt at gmail.com  |       Owner:  macports-dev at lists.macosforge.org
     Type:  enhancement        |      Status:  new                              
 Priority:  Normal             |   Milestone:  Port Updates                     
Component:  ports              |     Version:  1.5.0                            
 Keywords:                     |  
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 Ticket #13187 updated the port for the VIPS image processing library. It
 would be great to get the GUI, nip2, updated as well.

 The freebsd port, for reference: http://www.freshports.org/graphics/nip2
 the current supported tarball:
 http://www.vips.ecs.soton.ac.uk/vips-7.12/nip2-7.12.5.tar.gz

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Ticket URL: <https://svn.macosforge.org/projects/macports/ticket/13318>
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