For https://gitlab.winehq.org/wine/wine/-/merge_requests/7512 to use it to locate window shared objects.
-- v2: win32u: Use the session shared object to implement is_window. win32u: Use the session shared object for user handle entries. server: Move the user object handle table to the shared memory. server: Use NTUSER_OBJ constants for user object types. server: Create a shared memory object for the global session.