[fpc-pascal] String error on Windows

[Ryan Joseph]

> On Oct 31, 2021, at 10:50 AM, Alexander Grotewohl via fpc-pascal <fpc-pascal at lists.freepascal.org> wrote:
> 
> Because += is a mistake and hopefully it's irreparably broken.
> 
> Does using just s:=s+';'; work?
> 

I thought they were behind a mode switch called "c operators" or something but either way I don't see why Windows would disable them. They're all over my program which runs on macOS and I don't want to remove them (like that operator myself).

Regards,
	Ryan Joseph