apr_requirement: require Homebrew's Apr on Sierra
apr_requirement: require Homebrew's Apr on Sierra

Sierra ships the headers/libraries still but for some reason decided to bin
the config scripts, which whilst seemingly not an issue for `mesos`
or `ganglia` it has broken `subversion`, `log4cxx`, `ctail`, `shibboleth`
and `passenger` that we know of so far. Let's assume more often than not
things are going to break without those config scripts around.

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