analytics.sh: use full uuidgen path on OS X.
analytics.sh: use full uuidgen path on OS X.

Fixes #575.

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