drop_unicast_in_l2_multicast and drop_gratuitous_arp appeared in MS:

commit 12b74dfadb5a ("ipv4: add option to drop unicast encapsulated in
L2 multicast")
commit 97daf3314550 ("ipv4: add option to drop gratuitous ARP packets")
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>