LIBDIR defaults to ${prefix}/lib, use ${libdir} to avoid issue on
64bit platforms.
(From OE-Core rev: e5c023abd5265293623ac993a048d7abb9b71a59)
Signed-off-by: Ting Liu <ting.liu@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>