timers: fix itimer/many thread hang, fix

fix:

 kernel/fork.c:843: error: ‘struct signal_struct’ has no member named ‘sum_sched_runtime’
 kernel/irq/handle.c:117: warning: ‘sparse_irq_lock’ defined but not used

Signed-off-by: Ingo Molnar <mingo@elte.hu>
1 file changed