Add cursor hittest window functionality (#2232)

Co-authored-by: z4122 <412213484@qq.com>
Co-authored-by: Kirill Chibisov <contact@kchibisov.com>

src/platform_impl/linux/x11/window.rs

@@ -1358,6 +1358,11 @@ impl UnownedWindow {
         self.set_cursor_position_physical(x, y)
     }
 
+    #[inline]
+    pub fn set_cursor_hittest(&self, _hittest: bool) -> Result<(), ExternalError> {
+        Err(ExternalError::NotSupported(NotSupportedError::new()))
+    }
+
     pub fn drag_window(&self) -> Result<(), ExternalError> {
         let pointer = self
             .xconn