formula: Remove reference to homebrew/x11
formula: Remove reference to homebrew/x11

That tap is now defunct.

Signed-off-by: Bob W. Hogg <c772a964fd55352a3510e5d535dd9ccc9ac30168@linux.com>

jmsundar/brew,Linuxbrew/brew,mahori/brew,konqui/brew,MikeMcQuaid/brew,vitorgalvao/brew,Homebrew/brew,pseudocody/brew,nandub/brew,reitermarkus/brew,ilovezfs/brew,maxim-belkin/brew,MikeMcQuaid/brew,mgrimes/brew,Linuxbrew/brew,alyssais/brew,JCount/brew,sjackman/homebrew,mahori/brew,pseudocody/brew,Linuxbrew/brew,vitorgalvao/brew,amar-laksh/brew_sudo,claui/brew,gregory-nisbet/brew,alyssais/brew,jmsundar/brew,DomT4/brew,vitorgalvao/brew,sjackman/homebrew,mgrimes/brew,konqui/brew,Linuxbrew/brew,aw1621107/brew,sjackman/homebrew,hanxue/linuxbrew,amar-laksh/brew_sudo,MikeMcQuaid/brew,palxex/brew,konqui/brew,mgrimes/brew,jmsundar/brew,nandub/brew,gregory-nisbet/brew,mahori/brew,aw1621107/brew,reelsense/brew,MikeMcQuaid/brew,DomT4/brew,nandub/brew,JCount/brew,maxim-belkin/brew,reitermarkus/brew,ilovezfs/brew,nandub/brew,amar-laksh/brew_sudo,pseudocody/brew,Homebrew/brew,maxim-belkin/brew,EricFromCanada/brew,palxex/brew,reelsense/brew,claui/brew,mahori/brew,hanxue/linuxbrew,palxex/brew,DomT4/brew,hanxue/linuxbrew,EricFromCanada/brew,EricFromCanada/brew,reelsense/brew,konqui/brew,aw1621107/brew,claui/brew,EricFromCanada/brew,claui/brew,reitermarkus/brew,DomT4/brew,vitorgalvao/brew,reitermarkus/brew,sjackman/homebrew,ilovezfs/brew,gregory-nisbet/brew,JCount/brew,Homebrew/brew,JCount/brew,Homebrew/brew,alyssais/brew