Division of 64bit integers will cause linker error undefined reference
to `__udivdi3'. Fix this by replacing divisions with div64_64

Fixes: 11d5f157 ("netfilter: xt_hashlimit: Create revision 2 to ...")
Signed-off-by: Vishwanath Pai <vpai@akamai.com>
Acked-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>