build: permit weak imports in Go reverse deps.
build: permit weak imports in Go reverse deps.

Go makes extensive use of weak imports so we need to allow them when
building Go-using software.

Closes https://github.com/Homebrew/homebrew-core/issues/4047.

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