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

[MacPorts]

#58696: Don't force the buildbot to build from source
---------------------------+---------------------
 Reporter:  ryandesign     |      Owner:  admin@…
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 Please revert [9dfffb1f00c3b9d56e6d83c33a8b3310138758fc/mpbb] or implement
 the suggestions in
 https://github.com/macports/mpbb/pull/12#issuecomment-452310520 to allow
 it to be configured.

 Now that we [ticket:57464 uninstall unneeded ports] on the buildbot
 workers, it is entirely possible for builds to get scheduled for ports
 whose archives have already been uploaded but which are not installed on
 the worker. We don't want to waste time rebuilding them on the worker.

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