[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@…):

 I just attached a full diff for the Portfile and patch files between
 1.59.0 and proposed 1.60.0.

 All of my dependent ports will have to be rebuilt because the Boost ABI
 has been changed enough to be incompatible.

 Other please review and test.

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:2>
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