FIX brew install before Cache has yet been created
FIX brew install before Cache has yet been created

Closes Homebrew/homebrew#7

Cache directory is created when downloading tarballs, but the new
hw.model stuff compiles the hw.model.c file there.

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