libs: add userspace-rcu library

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@35163 3c298f89-4303-0410-b956-a3cf2f4a3e73
libs: add lttng-ust library

Required for the LTTng package

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@35164 3c298f89-4303-0410-b956-a3cf2f4a3e73
devel: add lttng-tools package

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@35165 3c298f89-4303-0410-b956-a3cf2f4a3e73
elfutils: fix build with CONFIG_NLS_FULL (#12740)

Thanks to mva for providing logs.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@35166 3c298f89-4303-0410-b956-a3cf2f4a3e73