hostapd: update to version 2013-11-20

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38914 3c298f89-4303-0410-b956-a3cf2f4a3e73
hostapd: add support for auto-channel selection

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38915 3c298f89-4303-0410-b956-a3cf2f4a3e73