brew doctor: add check for stray .pc files
brew doctor: add check for stray .pc files

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