make: Sanitize pie.lds.S

Build one "section for all" only. This reflects
what we really do runtime with generated parasite
and restorer blobs.

Signle section is named as ".crblob".

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