Restore previous fails_with_llvm? behaviour
Restore previous fails_with_llvm? behaviour

I've not been very careful lately, I apologise.

Fixes Homebrew/homebrew#7338.
Linuxbrew/brew,toonetown/homebrew,MikeMcQuaid/brew,ilovezfs/brew,aw1621107/brew,JCount/brew,gordonmcshane/homebrew,Linuxbrew/brew,staticfloat/brew,mahori/brew,Homebrew/brew,DomT4/brew,amar-laksh/brew_sudo,hanxue/linuxbrew,sjackman/homebrew,nandub/brew,claui/brew,mgrimes/brew,hanxue/linuxbrew,MikeMcQuaid/brew,reelsense/brew,sjackman/homebrew,gregory-nisbet/brew,tonyg/homebrew,maxim-belkin/brew,nandub/brew,vitorgalvao/brew,EricFromCanada/brew,ilovezfs/brew,sjackman/homebrew,zmwangx/brew,rwhogg/brew,DomT4/brew,konqui/brew,pseudocody/brew,Homebrew/brew,AnastasiaSulyagina/brew,Linuxbrew/brew,ilovezfs/brew,vitorgalvao/brew,mgrimes/brew,reitermarkus/brew,bfontaine/brew,sjackman/homebrew,Homebrew/brew,AnastasiaSulyagina/brew,JCount/brew,rwhogg/brew,mahori/brew,mahori/brew,claui/brew,palxex/brew,rwhogg/brew,MikeMcQuaid/brew,staticfloat/brew,toonetown/homebrew,reelsense/brew,mahori/brew,JCount/brew,pseudocody/brew,mistydemeo/homebrew,mistydemeo/homebrew,muellermartin/dist,toonetown/homebrew,reitermarkus/brew,claui/brew,nandub/brew,maxim-belkin/brew,gregory-nisbet/brew,Homebrew/brew,DomT4/brew,EricFromCanada/brew,tonyg/homebrew,zmwangx/brew,maxim-belkin/brew,Linuxbrew/brew,staticfloat/brew,jmsundar/brew,EricFromCanada/brew,muellermartin/dist,bfontaine/brew,AnastasiaSulyagina/brew,jmsundar/brew,gordonmcshane/homebrew,gordonmcshane/homebrew,aw1621107/brew,vitorgalvao/brew,mistydemeo/homebrew,jmsundar/brew,hanxue/linuxbrew,gregory-nisbet/brew,zmwangx/brew,nandub/brew,konqui/brew,bfontaine/brew,alyssais/brew,mgrimes/brew,konqui/brew,EricFromCanada/brew,amar-laksh/brew_sudo,konqui/brew,claui/brew,reelsense/brew,palxex/brew,palxex/brew,reitermarkus/brew,pseudocody/brew,reitermarkus/brew,tonyg/homebrew,aw1621107/brew,alyssais/brew,alyssais/brew,MikeMcQuaid/brew,amar-laksh/brew_sudo,vitorgalvao/brew,muellermartin/dist,DomT4/brew,JCount/brew