[MacPorts] #59834: Boost: update to 1.76.0

[MacPorts]

#59834: Boost: update to 1.76.0
------------------------+----------------------
  Reporter:  michaelld  |      Owner:  mascguy
      Type:  update     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  boost      |
------------------------+----------------------
Changes (by mascguy):

 * cc: RJVB (added)


Comment:

 Another good idea, suggested by @RJVB: Consider adding a `dev` variant,
 requesting headers be installed. When not requested, would eliminate
 installation of the many thousands of headers per Boost port installation.

-- 
Ticket URL: <https://trac.macports.org/ticket/59834#comment:30>
MacPorts <https://www.macports.org/>
Ports system for macOS