This patch change the build chain to not use pie objects in the crtools
executable.

This done by building the shared source files twice:
 1. for parasite/restorer as '<file>-pie-build.o'
 2. for crtools as '<file>.o'
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>