backend: X11 后端添加获取窗口 metadata 信息方式

tests/core/CMakeLists.txt

@@ -9,6 +9,7 @@ add_executable(${TEST_APP_NAME}
     ${SOURCE_DIR}/config/runtime_config.c
     ${SOURCE_DIR}/backend/x11/backend.c
     ${SOURCE_DIR}/backend/x11/event.c
+    ${SOURCE_DIR}/backend/x11/window.c
     ${SOURCE_DIR}/core/layer.c
     ${SOURCE_DIR}/core/layout.c
     ${SOURCE_DIR}/core/runtime.c