build: write options to file.
build: write options to file.

These can be useful for later inspection or upload by `gist-logs` if
there's a failed install and it's unclear from logs alone what options
were used.

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