Improve reasoning in brew bottle for using gzip.
Improve reasoning in brew bottle for using gzip.

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