[MacPorts] #35897: Add a buildbot with +universal for all packages

[MacPorts]

#35897: Add a buildbot with +universal for all packages
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  Reporter:  mojca          |      Owner:  macports-tickets@…
      Type:  enhancement    |     Status:  new
  Priority:  Low            |  Milestone:
 Component:  buildbot/mpbb  |    Version:
Resolution:                 |   Keywords:
      Port:                 |
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Comment (by mojca):

 The main reason why I needed qt4-mac in the past was for example to
 satisfy the dependency of `gnuplot +wxt +qt` because wxWidgets 2.8 would
 not build as 64-bit and then this eventually pulled in `qt4-mac
 +universal` as a consequence. I don't know to what extent providing
 universal builds for all packages makes sense nowadays.

 We are still affected by the bug that when wine's dependency gets updated
 that dependency would not be built as universal (and building wine again
 doesn't help because it has been built already). We could get the ability
 to manually build individual ports with `+uniersal` once #52742 gets
 deployed. It would probably still help to have some compilers built
 universally to allow universal builds of other software (manually). Other
 than that I'm not sure what we still want to implement/deploy.

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Ticket URL: <https://trac.macports.org/ticket/35897#comment:19>
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