multilib task signatures turned out to have issues since
SIGGEN_EXCLUDERECIPES_ABISAFE and SIGGEN_EXCLUDE_SAFE_RECIPE_DEP
did not have multilib mappings. This adds those mappings in which
in turn improves multilib task checksums to match the standard
non-mulitlib versions.
(From OE-Core rev: ea872b735c92a30d03cfa32953e060430e6f7f0b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>