toolchain/eglibc: add missing ld-search-paths patch to 2.17

this patch is a copy of
trunk/toolchain/eglibc/patches/2.16/200-add-dl-search-paths.patch in
trunk/toolchain/eglibc/patches/2.17/200-add-ld-search-paths.patch
please use svn copy instead of applying it (like in
https://dev.openwrt.org/changeset/34290/)

the patch add /usr/lib in the ld search path (for eglibc 2.17),
thus helping libs like libnl-tiny.so (for iw), libjson.so.0 (for ubus,
jshn) to be found

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>
Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36141 3c298f89-4303-0410-b956-a3cf2f4a3e73