Generic code uses raw syscall numbers for:
 - syscall_seized, to execute through parasite control needed syscall;
 - parasite_stop_on_syscall, to trap couple of tasks on needed syscall.

As syscall numbers may differ (and differ for x86) between native and
compatible mode, we need proper syscall wrapper here.

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>