netifd: IPv6 sysctl, restart IPv6 in static mode to send RS

git-svn-id: svn://svn.openwrt.org/openwrt@35347 3c298f89-4303-0410-b956-a3cf2f4a3e73
firewall: flush conntrack table after changing interface rules

git-svn-id: svn://svn.openwrt.org/openwrt@35348 3c298f89-4303-0410-b956-a3cf2f4a3e73
scripts: bundle-libraries.sh: support mixing 32bit and 64bit binaries

git-svn-id: svn://svn.openwrt.org/openwrt@35349 3c298f89-4303-0410-b956-a3cf2f4a3e73