Ensure that the list of dependencies is included in the hash
as well as their contents
Prior to this, adding or removing dependencies with values
of "None" would not change the hash, despite diffsigs reporting
this difference.
(Bitbake rev: 727ca945177ce9bd44515cf611e3e95a09466d98)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>