uhttpd: update to the latest version, fixes a crash on early cgi/lua process termination

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

git-svn-id: svn://svn.openwrt.org/openwrt@37628 3c298f89-4303-0410-b956-a3cf2f4a3e73
libubox: update to the latest version, fixes a fd deletion race condition in uloop

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

git-svn-id: svn://svn.openwrt.org/openwrt@37629 3c298f89-4303-0410-b956-a3cf2f4a3e73
libubox: update to the latest version, fixes a fd deletion race condition in uloop

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

Backport of r37629

git-svn-id: svn://svn.openwrt.org/openwrt@37630 3c298f89-4303-0410-b956-a3cf2f4a3e73