tools/blktap - Use generic subdirs rules

diff -r d5447528b3a2 -r 0799fcb6f960 tools/blktap/Makefile
@@ -5,24 +5,6 @@ SUBDIRS-y += lib
 SUBDIRS-y += lib
 SUBDIRS-y += drivers
 
-.PHONY: all
-all: build
+.PHONY: all clean install
+all clean install: %: subdirs-%
 
-.PHONY: build
-build:
-	@set -e; for subdir in $(SUBDIRS-y); do \
-	$(MAKE) -C $$subdir all;       \
-		done
-
-.PHONY: install
-install:
-	@set -e; for subdir in $(SUBDIRS-y); do \
-		$(MAKE) -C $$subdir install; \
-	done
-
-.PHONY: clean
-clean:
-	rm -rf *.a *.so *.o *.rpm $(LIB) *~ $(DEPS) TAGS
-	@set -e; for subdir in $(SUBDIRS-y); do \
-	$(MAKE) -C $$subdir clean;       \
-		done