[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       |
-------------------------+--------------------------

Comment (by wuyongwei@…):

 I can confirm that it basically works, but I have to rebuild `mkvtoolnix`
 to make it work again, probably due to a `regex` ABI change. Is there a
 away to trigger the rebuild of other ports?

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Ticket URL: <https://trac.macports.org/ticket/50671#comment:7>
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