[MacPorts] #56110: Travis: skip building ports from the obsolete PortGroup

[MacPorts]

#56110: Travis: skip building ports from the obsolete PortGroup
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 Reporter:  mojca          |      Owner:  l2dy
     Type:  defect         |     Status:  new
 Priority:  Low            |  Milestone:
Component:  buildbot/mpbb  |    Version:
 Keywords:                 |       Port:
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 Our buildbot setup skips building ports from the obsolete PortGroup, while
 travis builds currently report a failure. Maybe we could skip building
 those ports on Travis as well if it's not too complicated. The code should
 already be in `mpbb`.

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Ticket URL: <https://trac.macports.org/ticket/56110>
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