Symlink brew zsh completion to default location.
Symlink brew zsh completion to default location.

Fixes Homebrew/homebrew#11867.

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