quad: add commands library to deep-clean

quad/Makefile

@@ -34,6 +34,7 @@ deep-clean:
 	$(MAKE) -C src/test clean
 	$(MAKE) -C src/queue clean
 	$(MAKE) -C src/computation_graph clean
+	$(MAKE) -C src/commands clean
 	$(MAKE) -C src/quad_app clean
 	bash scripts/clean_xsdk_workspace.sh