[MacPorts] #52742: buildbot: add support for building variants

[MacPorts]

#52742: buildbot: add support for building variants
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  Reporter:  mojca           |      Owner:  admin@…
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:  buildbot        |
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Changes (by mojca):

 * Attachment "variants-mpbb-fully-outdated.diff" added.

 outdated patch for basic support of variants in mpbb

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Ticket URL: <https://trac.macports.org/ticket/52742>
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