make: remove pie/pigen/*.{gcda, gcno, gcov} on clean

Not nice to leave them.
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Makefile

@@ -278,7 +278,8 @@ clean: clean-built
 	$(Q) $(RM) ./*.img
 	$(Q) $(RM) ./*.out
 	$(Q) $(RM) ./*.bin
-	$(Q) $(RM) ./*.{gcda,gcno,gcov} ./test/`pwd`/*.{gcda,gcno,gcov} ./pie/*.{gcda,gcno,gcov}
+	$(Q) $(RM) ./*.{gcda,gcno,gcov} ./test/`pwd`/*.{gcda,gcno,gcov}
+	$(Q) $(RM) ./pie/*.{gcda,gcno,gcov} ./pie/piegen/*.{gcda,gcno,gcov}
 	$(Q) $(RM) -r ./gcov
 	$(Q) $(RM) protobuf-desc-gen.h
 	$(Q) $(MAKE) -C test $@