[MacPorts] #56267: Backport changes to release-2.4 for 2.4.4

[MacPorts]

#56267: Backport changes to release-2.4 for 2.4.4
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  Reporter:  raimue       |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:  MacPorts 2.4.4
 Component:  base         |    Version:
Resolution:               |   Keywords:  needs-backport
      Port:               |
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Comment (by raimue):

 Also backported to release-2.4:

 > system: Get rid of unused circbuf\\
 > https://github.com/macports/macports-
 base/commit/fcd8c218cf94951112803e1998d80b42bc693370

 Applied as [3e668ccc520940e2ece1e40533a6cbf361dc2b97/macports-ports].

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Ticket URL: <https://trac.macports.org/ticket/56267#comment:3>
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