BUILD: Accept krb5 1.16 for building the PAC plugin
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
Reviewed-by: Sumit Bose <sbose@redhat.com>
(cherry picked from commit ce68b4ff25cbd52935a540046f0412ce869a27a5)
(cherry picked from commit 09ba77f7de5011d4871fd261ab5291649f025404)