AA: eglibc: sync with trunk, delete old versions

Fixes build errors in the RPC code and adds parallel build support

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

git-svn-id: svn://svn.openwrt.org/openwrt@37596 3c298f89-4303-0410-b956-a3cf2f4a3e73