The batman-adv source code in openwrt-routing for OpenWrt 19.07 is
expecting the backports' compat code from OpenWrt 19.07. But the mac80211
package in wifi-ax is providing the ABI (and API) from a much newer kernel.
To work around this problem, a fork of the batman-adv package from OpenWrt
19.07 without the patches 0001-0004 can be used to switch to the new
netlink policy structure from newer kernel versions.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
