[MacPorts] #17280: Use xcode PortGroup in GPGAppKit

[MacPorts]

#17280: Use xcode PortGroup in GPGAppKit
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 Reporter:  nox at macports.org    |       Owner:  waqar at macports.org
     Type:  enhancement         |      Status:  new               
 Priority:  Normal              |   Milestone:  Port Enhancements 
Component:  ports               |     Version:                    
 Keywords:  xcode PortGroup cd  |        Port:  GPGAppKit         
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 GPGAppKit does not currently use the xcode PortGroup and use the [#12914
 `cd` TCL procedure].

 Changes:
  * Ported to xcode-1.0 PortGroup.
  * Does not use the cd procedure anymore (see #12914).

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Ticket URL: <http://trac.macports.org/ticket/17280>
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