The linux kernel 5.10 needs an explicit include of linux/if_bridge.h to
define br_multicast_list_adjacent and the struct br_ip_list.
Reported-by: Rosen Penev <rosenp@gmail.com> Fixes: 47cd2a4b627d ("batman-adv: update to version 2021.2") Signed-off-by: Sven Eckelmann <sven@narfation.org>