[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:
 Keywords:                  |       Port:  buildbot
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 It would be very handy to have some limited support for building with
 variants.

 Before trashing the subversion checkout on my buildbot, I wanted to attach
 partial patches.

 See #51995.

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