[OE-core] Сontinuous kernel rebuild after upgrade

[Yevhen Kyriukha]

Hi,

After upgrading oe-core and bitbake to the latest revision
(616354f13732d13c17434d5b60b166f691c25761 and
616354f13732d13c17434d5b60b166f691c25761 respectively)
I'm having broblems building my kernel.

Kernel rebuilds everytime I run "bitbake <some_recipe>".
It starts rebuilding from "do_unpack" task.

I noticed interesting things:
If I interrupt the build process and then start building again, kernel
is started building from the point of interruption.
But if kernel building completed successfully then next time when I
run bitbake it starts rebuild.

My previous version of bitbake and oe-core are
565b3e31e0226c6e193ee0b031bd5e7bef25591e
and ae28ee3f7a060b9e0d13154a84f2444a98490b5b respectively.

Best regards,
Yevhen