[MacPorts] #33472: qt4-mac warns about SDK dir not being found

[MacPorts]

#33472: qt4-mac warns about SDK dir not being found
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 Reporter:  cal@…             |       Owner:  michaelld@…           
     Type:  defect            |      Status:  new                   
 Priority:  Normal            |   Milestone:                        
Component:  ports             |     Version:  2.0.4                 
 Keywords:  haspatch          |        Port:  qt4-mac               
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 The qt4-mac port warns when built with Xcode 4.3; since the SDK path
 changed with Xcode 4.3, the warning in line 350 is printed.

 The attached patch fixes this.

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Ticket URL: <https://trac.macports.org/ticket/33472>
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