[MacPorts] #31948: apple-gcc42: change behavior of the -isysroot option

[MacPorts]

#31948: apple-gcc42: change behavior of the -isysroot option
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 Reporter:  royliu@…             |       Owner:  macports-tickets@…                   
     Type:  defect               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  2.0.3                                
 Keywords:  haspatch             |        Port:  apple-gcc42                          
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Comment(by royliu@…):

 I've also attached a cumulative patch for the port itself in `patch-
 isysroot.diff`.

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Ticket URL: <https://trac.macports.org/ticket/31948#comment:3>
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