[MacPorts] #60878: Let ports opt in to being built for different deployment targets on buildbot

[MacPorts]

#60878: Let ports opt in to being built for different deployment targets on
buildbot
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  Reporter:  ryandesign     |      Owner:  admin@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by ryandesign):

 Definitely; didn't realize legacysupport didn't already support that. It
 needs to support that, since MacPorts allows it.

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Ticket URL: <https://trac.macports.org/ticket/60878#comment:4>
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