[fpc-pascal] Better way to handle callback types

[Ryan Joseph]

> On Aug 21, 2021, at 1:30 PM, Michael Van Canneyt <michael at freepascal.org> wrote:
> 
> "Reference to" can be used for the others as well.

How do you mean?  Reference to is currently only available for cblocks on macOS I think so I'm not sure how this would look.

Regards,
	Ryan Joseph