os/mac.rb: Fix locate for Linuxbrew
os/mac.rb: Fix locate for Linuxbrew

hanxue/linuxbrew,maxim-belkin/brew,rwhogg/brew,Linuxbrew/brew,Linuxbrew/brew,rwhogg/brew,maxim-belkin/brew,hanxue/linuxbrew,Linuxbrew/brew,maxim-belkin/brew,hanxue/linuxbrew,Linuxbrew/brew,rwhogg/brew