X11Dependency: return nil instead of raising in #<=>
X11Dependency: return nil instead of raising in #<=>

Returning nil is in the contract of the Comparable module, and a future
version of Ruby will no longer hide this error.

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