[MacPorts] #59834: Boost: refactor and enhance

[MacPorts]

#59834: Boost: refactor and enhance
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  Reporter:  michaelld    |      Owner:  mascguy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  boost        |
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Comment (by mascguy):

 Reconciled `boost` to be as consistent with `boost171` as possible:

 https://github.com/macports/macports-
 ports/commit/c603d5c8548a56ef200071f43a09e696cdbec8a2

 Ditto for `boost169`:

 https://github.com/macports/macports-
 ports/commit/3b9a3cd96cd56a29538be7a7baebcde3c7bdca9d

 This is a first step toward migrating shared logic to a portgroup.

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Ticket URL: <https://trac.macports.org/ticket/59834#comment:36>
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