x86_64 fixes: make sure the fall back routine for using umount2() for umount() actually works :)
x86_64 fixes: make sure the fall back routine for using umount2() for umount() actually works :)

joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc,joel-porquet/tsar-uclibc