Bumping reductions manually will not be supported in future releases of the

BEAM and has dubious value anyway.  Remove that and ignore queue depth for
now.

src/async_nif.hrl

@@ -25,8 +25,7 @@
         begin
             NIFRef = erlang:make_ref(),
             case erlang:apply(Fun, [NIFRef|Args]) of
-                {ok, {enqueued, QDepth}} ->
-                    [erlang:bump_reductions(10 * QDepth) || is_integer(QDepth), QDepth > 100],
+                {ok, {enqueued, _QDepth}} ->
                     receive
                         {NIFRef, {error, shutdown}=Error} ->
                             %% Work unit was queued, but not executed.