utils/ruby.sh: fix Ruby path searching
utils/ruby.sh: fix Ruby path searching

Homebrew/brew,JCount/brew,MikeMcQuaid/brew,JCount/brew,claui/brew,claui/brew,MikeMcQuaid/brew,EricFromCanada/brew,EricFromCanada/brew,nandub/brew,MikeMcQuaid/brew,nandub/brew,claui/brew,MikeMcQuaid/brew,Homebrew/brew,nandub/brew,EricFromCanada/brew,JCount/brew,JCount/brew,nandub/brew,EricFromCanada/brew,Homebrew/brew,Homebrew/brew,claui/brew