build-gnu.sh: Enable test/df/no-mtab-status.sh

Author: oech3

util/build-gnu.sh

@@ -171,6 +171,8 @@ grep -rl '\$abs_path_dir_' tests/*/*.sh | xargs -r "${SED}" -i "s|\$abs_path_dir
 "${SED}" -i 's/^print_ver_.*/require_selinux_/' tests/runcon/runcon-no-reorder.sh
 "${SED}" -i 's/^print_ver_.*/require_selinux_/' tests/chcon/chcon-fail.sh
 
+# Avoid LD_PRELOAD
+sed -e 's|.*maybe LD_PRELOAD.*||' -e's|^export LD_PRELOAD=.*|function df { unshare -rm bash -c "mount -t tmpfs tmpfs /proc \&\& command df \"\$@\""; }|' tests/df/no-mtab-status.sh
 # We use coreutils yes
 "${SED}" -i "s|--coreutils-prog=||g" tests/misc/coreutils.sh
 # Different message