meta-raspberrypi and some other systems are ARMv6k but tell OE that
they're ARMv6 which doesn't fully support non-word atomics. armv6k
does, but Boost didn't handle the recognition correctly in the 1.56
release. Backport the patch that fixes the build.
See: https://svn.boost.org/trac/boost/ticket/10446 Signed-off-by: Peter A. Bigot <pab@pabigot.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
