[MacPorts] #56637: cmake and gobject_introspection portgroups together cause invalid CC archflags

[MacPorts]

#56637: cmake and gobject_introspection portgroups together cause invalid CC
archflags
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  Reporter:  drkp    |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by drkp):

 I added a join in the gobject_introspection portgroup to handle the
 braces, but it sounds like the real problem is that the braces are showing
 up in the first place, and I'm not sure why that's happening.

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Ticket URL: <https://trac.macports.org/ticket/56637#comment:4>
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