hook up test/todo in the toplevel test makefile

test/Makefile

@@ -25,6 +25,7 @@ continue:
 	@$(MAKE) -C ref all
 	@$(MAKE) -C err all
 	@$(MAKE) -C misc all
+	@$(MAKE) -C todo all
 
 mostlyclean:
 	@$(MAKE) -C asm clean
@@ -33,6 +34,7 @@ mostlyclean:
 	@$(MAKE) -C ref clean
 	@$(MAKE) -C err clean
 	@$(MAKE) -C misc clean
+	@$(MAKE) -C todo clean
 
 clean: mostlyclean
 	@$(call RMDIR,$(WORKDIR))