layer.conf: Add missing dependency exclusion
Add a dependency which should have been in this list but wasn't, found
when debugging create-spdx hash issues.
(From OE-Core rev: 97c84ca1e138fe95ebd67f1fe42be19ab2aeca89)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 1075b9fc5d562dada45b3187cb737511ff8c7376)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Richard Purdie