add uclient, a small HTTP/1.1 client library (+ utility), using ustream-ssl

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40738 3c298f89-4303-0410-b956-a3cf2f4a3e73
libubox: update to the latest version, adds minor enhancements/fixes for uloop, blobmsg, kvlist and json_script

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40739 3c298f89-4303-0410-b956-a3cf2f4a3e73
procd: add explicit libubox dependency to force rebuild on ABI changes (#16300)

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40740 3c298f89-4303-0410-b956-a3cf2f4a3e73