build: Don't call for compel execution on clean targets

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Reviewed-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/pie/Makefile

@@ -51,7 +51,9 @@ CFLAGS			+= -Wp,-U_FORTIFY_SOURCE -Wp,-D_FORTIFY_SOURCE=0
 
 
 ccflags-y		+= -DCR_NOGLIBC
+ifneq ($(filter-out clean mrproper,$(MAKECMDGOALS)),)
 NATIVE_CFLAGS		:= $(shell $(SRC_DIR)/compel/compel --arch=$(ARCH) cflags)
+endif
 
 ifeq ($(ARCH),x86)
         NATIVE_CFLAGS	+= -DCONFIG_X86_64