busybox.inc: Add sanity check to test if the suid binary provides sh
Add a sanity check during the do_compile task to fail if the suid
busybox provides /bin/sh. This is considered as a hard fail since not
only is providing sh as suid problematic for security reasons but also
because the sh configured for suid is less functional than the nosuid
configured sh and breaks a number of required features (e.g. 64-bit
test).
Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
