Clarify ENV.gcc, ENV.llvm c++ compiler names
Clarify ENV.gcc, ENV.llvm c++ compiler names

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