libqxt: retire to the boneyard
libqxt: retire to the boneyard

Closes Homebrew/homebrew#39074.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

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