linkage_checker: unnecessary dependencies
linkage_checker: unnecessary dependencies

- rename 'extraneous' to 'unnecessary'
- add the report under `linkage --test`

JCount/brew,Linuxbrew/brew,sjackman/homebrew,Homebrew/brew,MikeMcQuaid/brew,mahori/brew,MikeMcQuaid/brew,aw1621107/brew,vitorgalvao/brew,palxex/brew,DomT4/brew,reelsense/brew,jmsundar/brew,konqui/brew,aw1621107/brew,hanxue/linuxbrew,Linuxbrew/brew,reitermarkus/brew,vitorgalvao/brew,palxex/brew,nandub/brew,konqui/brew,DomT4/brew,nandub/brew,alyssais/brew,JCount/brew,DomT4/brew,MikeMcQuaid/brew,claui/brew,jmsundar/brew,pseudocody/brew,sjackman/homebrew,nandub/brew,konqui/brew,aw1621107/brew,Linuxbrew/brew,claui/brew,Linuxbrew/brew,hanxue/linuxbrew,JCount/brew,alyssais/brew,JCount/brew,claui/brew,ilovezfs/brew,reelsense/brew,EricFromCanada/brew,maxim-belkin/brew,DomT4/brew,amar-laksh/brew_sudo,Homebrew/brew,mgrimes/brew,reitermarkus/brew,vitorgalvao/brew,mgrimes/brew,hanxue/linuxbrew,vitorgalvao/brew,EricFromCanada/brew,konqui/brew,palxex/brew,mahori/brew,amar-laksh/brew_sudo,jmsundar/brew,sjackman/homebrew,nandub/brew,maxim-belkin/brew,pseudocody/brew,amar-laksh/brew_sudo,pseudocody/brew,ilovezfs/brew,Homebrew/brew,maxim-belkin/brew,alyssais/brew,claui/brew,reitermarkus/brew,mahori/brew,Homebrew/brew,reelsense/brew,ilovezfs/brew,sjackman/homebrew,mgrimes/brew,mahori/brew,MikeMcQuaid/brew,EricFromCanada/brew,reitermarkus/brew,EricFromCanada/brew