extend/os/mac/diagnostic: remove redundant method
extend/os/mac/diagnostic: remove redundant method

Remove an exact duplicate from further up in the same file. (It was
accidentally added in 8a582f2bd976ce7044c3b2dc6eef701f94b9ace5.)

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