Use $(RM) instead of rm -f in Makefile

Makefile

@@ -46,7 +46,7 @@ $(OBJ_DIR):
 	mkdir -p $(OBJ_DIR)
 
 last-gtk.h: $(SRC_DIR)/last-gtk.css
-	xxd --include $(SRC_DIR)/last-gtk.css > $(SRC_DIR)/last-gtk.h || (rm $(SRC_DIR)/last-gtk.h; false)
+	xxd --include $(SRC_DIR)/last-gtk.css > $(SRC_DIR)/last-gtk.h || ($(RM) $(SRC_DIR)/last-gtk.h; false)
 
 install: all
 	install -Dm755 $(BIN) $(DESTDIR)$(PREFIX)/bin/$(BIN)
@@ -60,19 +60,19 @@ install: all
 	$(compile_schemas)
 	install -Dm644 resources/themes/standard/standard.css $(DESTDIR)$(PREFIX)/share/LAST/themes/standard/standard.css
 uninstall:
-	rm -f $(DESTDIR)$(PREFIX)/bin/$(BIN)
-	rm -f $(DESTDIR)$(PREFIX)/share/applications/$(APP)
-	rm -rf $(DESTDIR)$(PREFIX)/share/LAST
+	$(RM) $(DESTDIR)$(PREFIX)/bin/$(BIN)
+	$(RM) $(DESTDIR)$(PREFIX)/share/applications/$(APP)
+	$(RM) -r $(DESTDIR)$(PREFIX)/share/LAST
 	for size in 16 22 24 32 36 48 64 72 96 128 256 512; do \
-		rm -f $(DESTDIR)$(PREFIX)/share/icons/hicolor/"$$size"x"$$size"/apps/$(ICON).png ; \
+		$(RM) $(DESTDIR)$(PREFIX)/share/icons/hicolor/"$$size"x"$$size"/apps/$(ICON).png ; \
 	done
 
 remove-schema:
-	rm $(DESTDIR)$(PREFIX)/share/glib-2.0/schemas/$(SCHEMA)
+	$(RM) $(DESTDIR)$(PREFIX)/share/glib-2.0/schemas/$(SCHEMA)
 	$(compile_schemas)
 
 # Clean target to remove object files and LAS executable
 clean:
-	rm -rf $(BIN) $(OBJ_DIR) $(SRC_DIR)/last-gtk.h
+	$(RM) -r $(BIN) $(OBJ_DIR) $(SRC_DIR)/last-gtk.h
 
 .PHONY: all last-gtk.h install uninstall remove-schema clean