imm32: Use the PostMessageW for WM_IME_NOTIFY message.

[Byeong-Sik Jeon]

Thanks you.

Dmitry Timoshkov wrote:
> "Byeong-Sik Jeon" <wjsqudtlr at gmail.com> wrote:
> 
> > I think we have to use "PostMessage" to send WM_IME_SETCONTEXT too.
> > Using the "SendMessage" change the real WM_IME_* message ordering. It
> > caused misunderstooding when I tested for my IME message test program.
> > But, at currently wine IME implementation, it is a minor problem.
> > I'll consider this problem when i test on my local git branch. :)
> 
> I'd suggest in order to avoid misunderstanding and speculation pay a bit
> of attention to the results of existing message tests, and if necessary
> exercise being implemented behaviour in new tests.
>