[MacPorts] #20426: imake uses cpp instead of ${configure.cpp}

[MacPorts]

#20426: imake uses cpp instead of ${configure.cpp}
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 Reporter:  ryandesign@…             |       Owner:  mcalhoun@…           
     Type:  defect                   |      Status:  new                  
 Priority:  Normal                   |   Milestone:                       
Component:  ports                    |     Version:  1.7.1                
 Keywords:                           |        Port:  imake                
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 Using the script mentioned in UsingTheRightCompiler I see imake uses "cpp"
 instead of what we pass as ${configure.cpp}. Seems to be the same deal as
 the xorg-* ports which use the environment variable RAWCPP instead of CPP.
 The attached patch fixes it.

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Ticket URL: <http://trac.macports.org/ticket/20426>
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