No need to fill symtab at restorer - previous commit add vdso filling at
startup: on vdso_init().
Now it's possible just to use the symtab and sizes if we need them.

travis-ci: success for Rectify 32-bit compatible C/R on x86
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>