its desireable for other layers to be able to append to the list of packages
with 'safe ABI's which are excluded from the sstate signatures.
I can't emphasise enough how careful you need to be with this list, anything
excluded here needs to be things which don't change interface and are consistent
between different machines.
(From OE-Core rev: 5adef35691a956c3071c0a1ed1caf6b58d1ec5a1)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>