Fix Xcode 4 compiler paths for --use-gcc
Fix Xcode 4 compiler paths for --use-gcc

Signed-off-by: Adam Vandenberg <34c2b6407fd5a10249a15d699d40f9ed1782e98c@gmail.com>

hanxue/linuxbrew,aw1621107/brew,reelsense/brew,muellermartin/dist,tonyg/homebrew,bfontaine/brew,jmsundar/brew,palxex/brew,mahori/brew,aw1621107/brew,bfontaine/brew,staticfloat/brew,maxim-belkin/brew,reitermarkus/brew,reelsense/brew,gregory-nisbet/brew,toonetown/homebrew,mgrimes/brew,Homebrew/brew,toonetown/homebrew,amar-laksh/brew_sudo,mistydemeo/homebrew,jmsundar/brew,amar-laksh/brew_sudo,muellermartin/dist,MikeMcQuaid/brew,MikeMcQuaid/brew,zmwangx/brew,reelsense/brew,vitorgalvao/brew,konqui/brew,EricFromCanada/brew,mahori/brew,sjackman/homebrew,palxex/brew,hanxue/linuxbrew,claui/brew,AnastasiaSulyagina/brew,amar-laksh/brew_sudo,Homebrew/brew,zmwangx/brew,claui/brew,vitorgalvao/brew,tonyg/homebrew,MikeMcQuaid/brew,gregory-nisbet/brew,reitermarkus/brew,JCount/brew,DomT4/brew,EricFromCanada/brew,rwhogg/brew,rwhogg/brew,nandub/brew,zmwangx/brew,jmsundar/brew,DomT4/brew,sjackman/homebrew,AnastasiaSulyagina/brew,Linuxbrew/brew,JCount/brew,ilovezfs/brew,pseudocody/brew,maxim-belkin/brew,gordonmcshane/homebrew,mahori/brew,EricFromCanada/brew,konqui/brew,pseudocody/brew,MikeMcQuaid/brew,Linuxbrew/brew,palxex/brew,aw1621107/brew,JCount/brew,gregory-nisbet/brew,staticfloat/brew,JCount/brew,AnastasiaSulyagina/brew,alyssais/brew,Homebrew/brew,claui/brew,nandub/brew,mahori/brew,reitermarkus/brew,nandub/brew,vitorgalvao/brew,sjackman/homebrew,staticfloat/brew,alyssais/brew,konqui/brew,rwhogg/brew,Homebrew/brew,DomT4/brew,toonetown/homebrew,muellermartin/dist,EricFromCanada/brew,alyssais/brew,nandub/brew,DomT4/brew,mistydemeo/homebrew,konqui/brew,vitorgalvao/brew,Linuxbrew/brew,gordonmcshane/homebrew,mistydemeo/homebrew,mgrimes/brew,pseudocody/brew,tonyg/homebrew,maxim-belkin/brew,gordonmcshane/homebrew,claui/brew,ilovezfs/brew,sjackman/homebrew,reitermarkus/brew,mgrimes/brew,hanxue/linuxbrew,bfontaine/brew,ilovezfs/brew,Linuxbrew/brew