Using diskutil command instead of deprecated fstyp command

git-svn-id: svn+ssh://svn.code.sf.net/p/cloverefiboot/code@3069 52d7a1c0-eba5-4e63-a9d7-e3186cd7c462
Fix an issue in th RC Scripts

git-svn-id: svn+ssh://svn.code.sf.net/p/cloverefiboot/code@3070 52d7a1c0-eba5-4e63-a9d7-e3186cd7c462