[MacPorts] #58696: Don't force the buildbot to build from source

[MacPorts]

#58696: Don't force the buildbot to build from source
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  defect         |     Status:  new
  Priority:  High           |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by jmroot):

 Let's try to minimise patching in the CI scripts. Different behaviour is
 legitimately needed there, so make it an option as Mojca suggested in the
 comment linked from the ticket description.

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Ticket URL: <https://trac.macports.org/ticket/58696#comment:10>
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