pie: x86 -- Do a real call for applying relocations

At moment both parasite and restorer do not have
any relocs because we support x86-64 only, but
this will be changed soon so do a call and apply
relocations.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>