[fpc-pascal]parameter is 0x0 on callback

[Peter Vreman]

> Hi again,
>
> the problem seems to occur any time I try to access (unit global)
> variables in a cdecl-ed procedure or function, too. They are simply
> invisible in the debugger.
>
> What am I doing wrong here?

Try the 1.9.4 release, there are fixes in the debuginfo generation