Makefiles: introduce/use COMPEL_BIN

We call compel-host binary from a number of places, so
let's add COMPEL_BIN variable and use it.

travis-ci: success for More polishing for compel cli
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

Makefile.compel

+COMPEL_BIN		:= $(SRC_DIR)/compel/compel-host
+export COMPEL_BIN
+
 COMPEL_VERSION_HEADER	:= compel/include/version.h
 
 $(COMPEL_VERSION_HEADER): $(SRC_DIR)/Makefile.versions

criu/pie/Makefile

@@ -36,7 +36,7 @@ ccflags-y	+= -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0
 ccflags-y	+= -Wp,-U_FORTIFY_SOURCE -Wp,-D_FORTIFY_SOURCE=0
 
 ifneq ($(filter-out clean mrproper,$(MAKECMDGOALS)),)
-        CFLAGS	+= $(shell $(SRC_DIR)/compel/compel-host cflags)
+        CFLAGS	+= $(shell $(COMPEL_BIN) cflags)
 endif
 
 ifeq ($(SRCARCH),arm)
@@ -63,9 +63,9 @@ $(obj)/%.built-in.bin.o: $(obj)/%.built-in.o $(obj)/pie.lib.a $(compel_lds)
 
 $(obj)/%-blob.h: $(obj)/%.built-in.bin.o $(SRC_DIR)/compel/compel-host-bin
 	$(call msg-gen, $@)
-	$(Q) $(SRC_DIR)/compel/compel-host hgen -f $<			\
-		-l 4							\
-		-p $(call target-name,$@)				\
+	$(Q) $(COMPEL_BIN) hgen -f $<		\
+		-l 4				\
+		-p $(call target-name,$@)	\
 		-o $@ $(piegen_stdout)
 
 all-y += $(BLOBS)