json-c: drop compatibility libraries

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36758 3c298f89-4303-0410-b956-a3cf2f4a3e73
ubus: update to latest version, fixes json-c library name

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36759 3c298f89-4303-0410-b956-a3cf2f4a3e73