[MacPorts] #14573: update the Portfile for vips

[MacPorts]

#14573: update the Portfile for vips
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  Reporter:  jcupitt at gmail.com  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  enhancement        |      Status:  new                                  
  Priority:  Normal             |   Milestone:  Port Updates                         
 Component:  ports              |     Version:  1.6.0                                
Resolution:                     |    Keywords:                                       
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Comment (by jcupitt at gmail.com):

 for reference, the last vips ticket: #13187

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14573#comment:1>
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