[MacPorts] #67700: Buildbot builds dependency from source when binary is available

[MacPorts]

#67700: Buildbot builds dependency from source when binary is available
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by jmroot):

 Ah of course, the `_archive_available` check only considers the primary
 archive server.

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Ticket URL: <https://trac.macports.org/ticket/67700#comment:3>
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