Instead of leaking kernel pointers.
-- v2: user32: Always use original parameter values in dispatch_send_message. wow64win: Implement wow64_NtUserMessageCall. wow64win: Implement wow64_NtUserCallWinProc. win32u: Remove no longer needed unicode call_hooks argument. win32u: Use send_message_timeout for WM_CREATE and WM_NCCREATE. user32: Pass window name as UNICODE_STRING to NtUserCreateWindowEx. win32u: Pack messages sent directly from win32u.