[user32] Add DECLSPEC_NOINLINE, use it on call_hook_proc()

[Dan Kegel]

I suspect this is a real fix, and there is no gcc bug.

On Fri, Apr 19, 2013 at 9:47 AM, Qian Hong <fracting at gmail.com> wrote:
> Hi Dan,
>
> Thanks for working on it! It is really an annoying bug, however, is
> adding DECLSPEC_NOINLINE a workaround or a real fix? If it is only a
> workaround, would that hide some real bug behind it? Or is that
> possible that there is a gcc bug here that we want to report to gcc?
>
> Thanks for your time!