Makefile: reorg top-level clean/mrproper

Mostly this is done in order to not repeat the recursive clean
lines twice.
Signed-off-by: Kir Kolyshkin <kir@openvz.org>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

Makefile

@@ -244,13 +244,7 @@ lib: criu
 	$(Q) $(MAKE) $(build)=lib all
 .PHONY: lib
 
-subclean:
-	$(Q) $(MAKE) -C Documentation clean
-	$(Q) $(MAKE) $(build)=test/compel clean
-	$(Q) $(RM) .gitid
-.PHONY: subclean
-
-clean: subclean
+clean mrproper:
 	$(Q) $(MAKE) $(build)=images $@
 	$(Q) $(MAKE) $(build)=criu $@
 	$(Q) $(MAKE) $(build)=soccr $@
@@ -258,17 +252,17 @@ clean: subclean
 	$(Q) $(MAKE) $(build)=compel $@
 	$(Q) $(MAKE) $(build)=compel/plugins $@
 	$(Q) $(MAKE) $(build)=lib $@
-.PHONY: clean
+.PHONY: clean mrproper
 
-# mrproper depends on clean in nmk
-mrproper: subclean
-	$(Q) $(MAKE) $(build)=images $@
-	$(Q) $(MAKE) $(build)=criu $@
-	$(Q) $(MAKE) $(build)=soccr $@
-	$(Q) $(MAKE) $(build)=lib $@
-	$(Q) $(MAKE) $(build)=compel $@
-	$(Q) $(MAKE) $(build)=compel/plugins $@
-	$(Q) $(MAKE) $(build)=lib $@
+clean-top:
+	$(Q) $(MAKE) -C Documentation clean
+	$(Q) $(MAKE) $(build)=test/compel clean
+	$(Q) $(RM) .gitid
+.PHONY: clean-top
+
+clean: clean-top
+
+mrproper-top: clean-top
 	$(Q) $(RM) $(CONFIG_HEADER)
 	$(Q) $(RM) $(SOCCR_CONFIG)
 	$(Q) $(RM) $(VERSION_HEADER)
@@ -277,7 +271,9 @@ mrproper: subclean
 	$(Q) $(RM) compel/include/asm
 	$(Q) $(RM) cscope.*
 	$(Q) $(RM) tags TAGS
-.PHONY: mrproper
+.PHONY: mrproper-top
+
+mrproper: mrproper-top
 
 #
 # Non-CRIU stuff.