[MacPorts] #55926: Add C++11 variant to Boost

[MacPorts]

#55926: Add C++11 variant to Boost
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  Reporter:  michaelld    |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  boost, c++11, haspatch
      Port:  boost        |
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Comment (by michaelld):

 I'm looking for discussion of pros & cons to this change as is, as well as
 making +cxx11 a default variant for all installs (not just <= 10.8).

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Ticket URL: <https://trac.macports.org/ticket/55926#comment:1>
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