[fpc-pascal] Firebird embedded supported on Windows 64 by SEH patch

[Marco van de Voort]

In our previous episode, Reinier Olislagers said:
> > Is it usefull to make DISABLE_WIN64_SEH a command line switch?
> 
> >From my perspective: no, as it breaks using external dlls whose
> errors/exceptions incorrectly bubble up through to FPC.
> 
> However, perhaps Sergei has another opinion...

Probably he is only careful. Which is only wise.