[MacPorts] #30342: Update ARB for Lion (OS X 10.7) and Xcode 4

[MacPorts]

#30342: Update ARB for Lion (OS X 10.7) and Xcode 4
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 Reporter:  matt.cottrell@…        |       Owner:  macports-tickets@…                   
     Type:  update                 |      Status:  new                                  
 Priority:  Normal                 |   Milestone:                                       
Component:  ports                  |     Version:  2.0.0                                
 Keywords:  Lion Xcode 4 compiler  |        Port:  arb                                  
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 Xcode 4 introduces a default compiler (llvm-gcc-4.2) that does not work
 with ARB.  This patch updates the Portfile to set the compiler to gcc-
 apple-4.2.

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Ticket URL: <https://trac.macports.org/ticket/30342>
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