On some build configurations PER_CLEAR_ON_SETID symbol was not
found when compiling smack_lsm.c. This patch fixes the issue by
explicitly doing #include <linux/personality.h>.
Signed-off-by: NJarkko Sakkinen <jarkko.j.sakkinen@gmail.com>
Signed-off-by: NCasey Schaufler <cschaufler@cschaufler-intel.(none)>