superenv/cc: don't filter out `gdwarf-2`.
superenv/cc: don't filter out `gdwarf-2`.

It's needed by `cgo` which is used by a lot of Go software.

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