[MacPorts] #20133: py25-llvm overrides portgroup depends_lib

[MacPorts]

#20133: py25-llvm overrides portgroup depends_lib
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 Reporter:  snc@…             |       Owner:  snc@…           
     Type:  defect            |      Status:  new             
 Priority:  Normal            |   Milestone:                  
Component:  ports             |     Version:  1.7.1           
 Keywords:                    |        Port:  py25-llvm       
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 py25-llvm overrides the portgroup depends_lib.

 Update to use -append

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Ticket URL: <http://trac.macports.org/ticket/20133>
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