[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 mojca):

 At the time when we changed this, I  wasn't aware of the necessity to
 "rebuild already built ports" on our buildbot. Now that I know, it clearly
 makes more sense that we use different behaviour on buildbot and
 Travis/Azure, so let's use whatever way that's most straightforward to
 achieve what we want: still build everything from source on Travis, not
 forcing rebuild from source on buildbot, making sure that we don't skip
 any ports on the way, ...

 It might be best if l2dy takes care of the fix, as it's needed on both
 mpbb and go side?

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Ticket URL: <https://trac.macports.org/ticket/58696#comment:12>
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