criu/pie/Makefile: nuke SRC_DIR

This is a missing hunk from commit 85b04c8b "Makefiles: nuke $(SRC_DIR)"
which has somehow escaped from my attention.
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/pie/Makefile

@@ -37,7 +37,7 @@ endif
 asflags-y	+= -D__ASSEMBLY__
 
 BLOBS		+= $(obj)/restorer-blob.h $(obj)/parasite-blob.h
-LDS		:= $(SRC_DIR)/compel/arch/$(SRCARCH)/scripts/compel-pack.lds.S
+LDS		:= compel/arch/$(SRCARCH)/scripts/compel-pack.lds.S
 
 .SECONDARY: