libc/eglibc: backport OpenEmbedded patches for eglibc 2.16

With this 3 patches, I was able to build and run an eglibc-based system
on MIPS(el) and ARM targets.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

#!/bin/sh

set -e

printf "Running autoconf...\n"

autoconf -Wall --force

printf "Done. You may now run:\n    ./configure\n"