[MacPorts] #50671: boost: Update to 1.60.0

[MacPorts]

#50671: boost: Update to 1.60.0
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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 wuyongwei@…):

 The patch is updated (against ports SVN). It seems to work well for me,
 though I have to rebuild mkvtoolnix ''again'', which is a pain. However, I
 am happy I have finally a working Boost 1.61.0 port on my local drive now.
 ;-)

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:10>
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