[user32/tests] Only do the GetProcAddress once

[Paul Vriens]

Hi,

Only do the GetModuleHandle and GetProcAddress once for the needed functions.

This will also make sure that the number and types of arguments are checked (see 
   emails from Michael Stefaniuc from yesterday).

There is an assert generated on Vista (I think for not existing NotifyWinEvent), 
the extra tracing should shed some more light.

Changelog
    Only do the GetProcAddress once

Cheers,

Paul.

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