build: Don't forget to rebuild pie code on compel plugins change

https://github.com/checkpoint-restore/criu/issues/399Rerorted-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

Makefile.compel

@@ -28,6 +28,7 @@ LIBCOMPEL_SO		:= libcompel.so
 LIBCOMPEL_A		:= libcompel.a
 export LIBCOMPEL_SO LIBCOMPEL_A
 criu-deps		+= compel/$(LIBCOMPEL_A)
+criu-deps		+= $(compel-plugins)
 
 #
 # Compel itself.

criu/pie/Makefile

@@ -37,7 +37,7 @@ $(1)-obj-e	+= pie.lib.a
 $(1)-obj-e	+= $$(compel_plugins)
 
 # Dependency on compel linker script, to relink if it has changed
-$$(obj)/$(1).built-in.o: $$(LDS)
+$$(obj)/$(1).built-in.o: $$(LDS) $$(compel_plugins)
 
 $$(obj)/$(1)-blob.h: $$(obj)/$(1).built-in.o
 	$$(call msg-gen, $$@)