libtool: powerpc*le-linux support by Alan Modra <amodra@bigpond.net.au>

Patch created using the following changes in libtool:
http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=75ffb257
http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=056889b8
http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=bd998a7e
http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=429d40a0
http://git.savannah.gnu.org/cgit/libtool.git/commit/?id=8a8dfaec
config.guess: add ppc64le / ppcle support by Anton Blanchard <anton@samba.org>

Based on http://git.savannah.gnu.org/cgit/config.git/commit/?id=29900d3b