[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 michaelld@…):

 Initial testing the GNU Radio ports shows compatibility with a rev-bump. I
 didn't test them all, but the all of the primary related ports and some of
 the dependent ports build just fine using Boost 1.60.0 out of the box.
 They all require a rev-bump rebuild due to updated boost ABI.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:5>
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