[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:
Resolution:                |   Keywords:
      Port:  boost         |
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Comment (by manphiz@…):

 Hi, I just attached a patch for boost 1.51.0. Tested locally with
 +no_debug +no_static +python27 +universal.

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Ticket URL: <https://trac.macports.org/ticket/35814#comment:1>
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