[fpc-pascal] Large file support

[Marco van de Voort]

In our previous episode, Mattias Gaertner said:
> > 
> > Afaik Michael always works with trunk fpdoc, but of course the 3.0.2 docs
> > were generated in march.
> 
> The $if support was added recently to pscanner.

Ah ok, so it was $if vs $ifdef? Anyway, for now I added fs32bit deprecation
to major version to do (where I keep track of the various deprecations to remove
for a new branch).

If somebody uses this define, or what it might still be needed for, please
drop me a mail.