[MacPorts] #20863: boost update version to 1.40.0

[MacPorts]

#20863: boost update version to 1.40.0
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 Reporter:  christopher@…           |       Owner:  macports-tickets@…                   
     Type:  update                  |      Status:  new                                  
 Priority:  Normal                  |   Milestone:                                       
Component:  ports                   |     Version:  1.7.1                                
 Keywords:                          |        Port:  boost                                
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 Boost 1.40.0 has been released. I've attached a patch to the Portfile that
 allows it compile and build on my machine (MBP 10.5.8).

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Ticket URL: <http://trac.macports.org/ticket/20863>
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