[MacPorts] #50671: boost: Update to 1.65.1

[MacPorts]

#50671: boost: Update to 1.65.1
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  Reporter:  eborisch  |      Owner:  ryandesign
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:  haspatch
      Port:  boost     |
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Comment (by gaming-hacker):

 Replying to [comment:53 michaelld]:

 Nice work removing all the dead wood.  It seems there are a lot of other
 ports that still use older versions of libs.  I tried to force build boost
 and all dependencies with clang5, no gnu-gcc*, no apple compiler and
 failed.  I did manage to chop and hack the portfile and variants.conf to
 finally obtained a complete boost lib and dependents build with only
 clang4 but without any python.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:55>
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