companion_tools/libtool: Add libtool tool

Add version 2.2.6b of libtool as a companion tool

Signed-off-by: Richard Strand <richard.strand@icomera.com>

 reporter_name="Nye Liu"

 reporter_url="http://sourceware.org/ml/crossgcc/2008-10/msg00046.html"

 reporter_comment=""