modules: update routing

b8e0831 bird1: fix "Form token mismatch" errors in luci-app-bird1-ipv{4,6}
3d7df59 bird1: rename get_bool() to get_a_bool() in bird{4,6}-lib.sh
4e0e702 bird1-openwrt: fix Makefile issues
58a4a00 bird1-openwrt: use a single Makefile for IPv4 and IPv6 packages