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

[Dan Kegel]

Fixes http://bugs.winehq.org/show_bug.cgi?id=27468

Or we could just remove the 'static', but this seems more elegant.

(I don't know how important it is to get the visual C++ version cutoff
right, but the one I chose should definitely avoid using it
on compilers that don't support it.)
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