[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:  server/hosting  |    Version:
Resolution:                  |   Keywords:
      Port:  buildbot        |
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Comment (by mojca):

 I didn't check the logs, but among other things we also need:
 * (straightforward/trivial) a revised version of [attachment:variants-
 master.cfg.diff my old attempt] to add a field for variants to
 `master.cfg`
 * (lower priority) some basic logic to automatically build `+quartz` for
 certain ports

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Ticket URL: <https://trac.macports.org/ticket/52742#comment:5>
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