perf_counter tools: update to new syscall ABI

update the kerneltop userspace to work with the latest syscall ABI

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Paul Mackerras <paulus@samba.org>
Orig-LKML-Reference: <20090323172417.559643732@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>