Fix brew link --dry-run
Fix brew link --dry-run

The last make_relative_symlink was missing the mode argument, which
caused spurious linking under certain circumstances.

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