buildroot: allow specifying libc personality for external toolchains

git-svn-id: svn://svn.openwrt.org/openwrt@35703 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm47xx: do not use vlan0 any more.

The Broadcom switch driver says that vlan0 should not be used with any switch other than bcm5325.

This makes OpenWrt always use vlan1 and vlan2 instead.



git-svn-id: svn://svn.openwrt.org/openwrt@35704 3c298f89-4303-0410-b956-a3cf2f4a3e73