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

[MacPorts]

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

 I don't doubt the current code needs changes to work right when specifying
 arbitrary variants. Simply reverting that commit is not right either,
 though. The distinction between the canonical_active_variants and the
 variants that are being requested needs to be maintained.

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Ticket URL: <https://trac.macports.org/ticket/52742#comment:16>
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