Whilst collecting this list on the fly may be quicker, doing so within a
function that's meant to *query* the list of bbappends is poor practice.
(Bitbake rev: 5c12aa3b0010d7d1733e54a0ca7d0af465454210)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>