'make clean' was missing some steps

Makefile

@@ -375,7 +375,9 @@ clean:
 	$(MAKE) clean -C source/bridges-ui
 	$(MAKE) clean -C source/discovery
 	$(MAKE) clean -C source/modules
+	$(MAKE) clean -C source/native-plugins
 	$(MAKE) clean -C source/plugin
+	$(MAKE) clean -C source/theme
 	rm -f $(RES)
 	rm -f $(UIs)
 	rm -f $(WIDGETS)

source/plugin/Makefile

@@ -123,6 +123,7 @@ all: $(TARGETS)
 clean:
 	rm -f $(OBJDIR)/*.o $(TARGETS)
 	rm -f $(BINDIR)/carla.lv2/*.*
+	rm -f $(BINDIR)/carla-lv2-export$(APP_EXT)
 
 debug:
 	$(MAKE) DEBUG=true