classes/sanity: check for suid root command evility
Some users have been found to have an unnamed third-party piece of
software installed which sets chmod, chown and mknod as suid root as
part of its installation process. This interferes with the operation of
pseudo and can result in files really being owned by root within the
build output, and therefore breaks the build, apart from being a
security issue. Check for this and bail out if it is found.
Reported-by: Nicolas Dechesne <nicolas.dechesne@linaro.org> Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Saul Wold <sgw@linux.intel.com>
