[MacPorts] #19834: boost: update to 1.39

[MacPorts]

#19834: boost: update to 1.39
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 Reporter:  arsptr@…                 |       Owner:  sanchom@…        
     Type:  update                   |      Status:  new              
 Priority:  Normal                   |   Milestone:                   
Component:  ports                    |     Version:  1.7.1            
 Keywords:                           |        Port:  boost            
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Comment(by nox@…):

 I've just got my hands on this ticket. I'm currently writing a portfile
 for boost too. I've got everything working, except for the
 `--layout=system` part, which keeps whining about duplicate names when
 `+debug` and `+st` are enabled. The only missing thing for now is a
 universal variant.

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Ticket URL: <http://trac.macports.org/ticket/19834#comment:2>
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