[MacPorts] #71318: Remove `boost` wrapper port, it keeps breaking different dependents of Boost

[MacPorts]

#71318: Remove `boost` wrapper port, it keeps breaking different dependents of
Boost
--------------------------+--------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.10.4
 Keywords:                |       Port:  boost
--------------------------+--------------------
 The wrapper port serves no good purpose, its only function is breaking
 various consumers of Boost libs.

 Just another example: https://github.com/NickvisionApps/libnick/issues/50

 These errors never show up on CI or buildbots, for obvious reasons, but
 the current set-up is wrong. It wastes time on debugging and then forces
 to add per-port hacks via `conflicts_build`.

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Ticket URL: <https://trac.macports.org/ticket/71318>
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