Introduce __iv_list_steal_elements().
Introduce __iv_list_steal_elements().

For moving all elements on a list to another list, to be used for
enforcing fairness in various parts of ivykis.

Signed-off-by: Lennert Buytenhek <8858498612e3a522354216649776e3032dcb7e5b@wantstofly.org>

buytenh/ivykis,buytenh/ivykis