If a standalone tasks adds a dependency on X:do_build, the code in runqueue would
currently remove it if that do_build was part of an image recipe which uses
recrdeptask on do_build.
Such individual tasks shouldn't do this, therefore tweak the recursive reference code
to only process recurseive tasks, not all tasks.
(Bitbake rev: 4cfca360891e1ed876a9c19487b4f6210686af26)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>