winex11: Windows with WS_EX_NOACTIVATE style shouldn't be on the taskbar.

dlls/winex11.drv/window.c

@@ -1252,7 +1252,7 @@ void update_net_wm_states( Display *display, struct x11drv_win_data *data )
     ex_style = GetWindowLongW( data->hwnd, GWL_EXSTYLE );
     if (ex_style & WS_EX_TOPMOST)
         new_state |= (1 << NET_WM_STATE_ABOVE);
-    if (ex_style & WS_EX_TOOLWINDOW)
+    if (ex_style & (WS_EX_TOOLWINDOW | WS_EX_NOACTIVATE))
         new_state |= (1 << NET_WM_STATE_SKIP_TASKBAR) | (1 << NET_WM_STATE_SKIP_PAGER);
     if (!(ex_style & WS_EX_APPWINDOW) && GetWindow( data->hwnd, GW_OWNER ))
         new_state |= (1 << NET_WM_STATE_SKIP_TASKBAR);