boost: fix atomics for armv6

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>
tcmode-default: Define PREFERRED_VERSION for binutils-native

When using other toolchain layers, it does not pick
the OE-Core version eventhough not specified, its because
we did not pin it.

Change-Id: Ic47fd607a2a6535dd157d8afdd004197d2a6f60b
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
babeltrace: Add missing bison/flex depensencies.

* babeltrace do_configure failed due to missing flex/bison
  dependencies.

Signed-off-by: Noor Ahsan <noor_ahsan@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>