This appears to be caused by Jan's Kconfig changes to use menuconfig,
which lost a dependency on BRIDGE:
-menu "Bridge: Netfilter Configuration"
- depends on BRIDGE && BRIDGE_NETFILTER
tristate "Ethernet Bridge tables (ebtables) support"
ebtables is a general, extensible frame/packet identification
framework. Say 'Y' or 'M' here if you want to do Ethernet
filtering/NAT/brouting on the Ethernet bridge.
Does this patch fix it?