[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@…):

 If the ABI change happens frequently and we do not have a versioning
 mechanism for the boost dylibs, does it make sense that we make all the
 dependent ports link with the ''static'' libs? It will be a big change,
 but will likely reduce future breakages.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:12>
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