[MacPorts] #64428: boost178: create new port for latest upstream version

[MacPorts]

#64428: boost178: create new port for latest upstream version
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 Reporter:  reneeotten  |      Owner:  michaelld
     Type:  request     |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.7.1
 Keywords:              |       Port:  boost
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 Boost released v1.78.0 early December, it would be nice to have the latest
 version packaged in MacPorts as `boost178`. Additionally, what is the
 policy for the default version set by the `boost` PG? Currently it
 defaults to 1.76, when do we bump that?

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Ticket URL: <https://trac.macports.org/ticket/64428>
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