[MacPorts] #35814: boost: update to 1.51.0

[MacPorts]

#35814: boost: update to 1.51.0
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 Reporter:  ryandesign@…             |       Owner:  adfernandes@…           
     Type:  update                   |      Status:  new                     
 Priority:  Normal                   |   Milestone:                          
Component:  ports                    |     Version:                          
 Keywords:                           |        Port:  boost                   
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 [http://www.boost.org/users/history/version_1_51_0.html boost 1.51.0 is
 available]; not sure if we should update or wait awhile. (Not sure if our
 boost-using ports are compatible with this version.)

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Ticket URL: <https://trac.macports.org/ticket/35814>
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