binutils-2.20.1: Update libtool files so cross native builds are correct.

binutils-2.20.1: Update libtool files so cross native builds are correct.

* Currently libtool adds -L/usr/lib to the link command which directs
  linker to pull from /usr/lib. Many distro's dont have stuff which is
  conflicting in /usr/lib with the target libraries but some do. Like
  archlinux has libgcc_s.so.1 in /usr/lib due to the above -L it gets
  picked over the target libgcc and the link command fails. -L/usr/lib
  is generated by libtool when it sees -rpath /usr/lib which may be not
  the right think when doing cross native builds.

Signed-off-by: Khem Raj <raj.khem@gmail.com>