[MacPorts] #17661: proj: update to version 4.6.1

[MacPorts]

#17661: proj: update to version 4.6.1
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 Reporter:  devans@…             |       Owner:  seanasy@…        
     Type:  enhancement          |      Status:  new              
 Priority:  Normal               |   Milestone:  Port Updates     
Component:  ports                |     Version:  1.8.0            
 Keywords:                       |        Port:  proj             
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 Attached is proposed patch to
  * Update proj from 4.6.0 to 4.6.1
  * fix livecheck
  * add platforms
  * lint (whitespace)

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Ticket URL: <http://trac.macports.org/ticket/17661>
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