Use the new sequential option of RunningBuild to ensure this.
Fixes the first part of [YOCTO #1311]
(Bitbake rev: 972769e6362ea3cf35c8fb7cdfbb147758d0a2f2)
Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>