[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 adfernandes@…):

 Thank you; I'm always a little afraid of new versions of boost because
 they seem to get odd little weirdnesses that you only find after a 16 hour
 compile!

 Verifying and will commit when tested.

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Ticket URL: <https://trac.macports.org/ticket/35814#comment:2>
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