Fix brew update on Leopard
Fix brew update on Leopard

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