When changing multilibs, allarch recipes should not be rebuilding. This
adds enough variable exclusions to make this work properly. Future
regressions will be prevented with new testing.
(From OE-Core rev: ce1e7fcc60276040477c1d5e3129e029bb9f204b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>