ubox: update to the latest version, reduces binary library dependencies

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40857 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: add a config option for enabling /proc/slabinfo

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40858 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: make support for PC-OEM cards optional, reduces module size

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40859 3c298f89-4303-0410-b956-a3cf2f4a3e73