[MacPorts] #71389: libproxy: move vala bindings to a variant or subport to reduce dependencies count

[MacPorts]

#71389: libproxy: move vala bindings to a variant or subport to reduce dependencies
count
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  Reporter:  jleroy       |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  libproxy     |
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Comment (by ryandesign):

 You can `grep` the Portfiles for `subport` and see what they do. I suppose
 each case is different so there's not a great way to give an example.

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Ticket URL: <https://trac.macports.org/ticket/71389#comment:7>
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