It was never functional neither we plan to support
native ia32 mode, so drop these incomplete code
pieces out.

 - Presumably we will need TASK_SIZE for compat
   mode so I provide TASK_SIZE_IA32 for this sake

 - 32 bit syscalls are remaining for a while
Acked-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>