Add GDC among compilers of https://run.dlang.io/

[BoQsc]

On Sunday, 17 September 2023 at 12:12:27 UTC, Steven 
Schveighoffer wrote:
> On 9/17/23 2:49 AM, BoQsc wrote:
>> Often you want to quickly test if something works consistently 
>> across compilers.
>> Please add GDC to the https://run.dlang.io/ to make embeddable 
>> proofs easier.
>
> Have you tried godbolt? I believe gdc is there.
>
> I agree it should be available.
>
> -Steve

I tried, and couldn't figure out how to see the output of even 
the basic `writeln`.
Because of that I'm already in favor of continuing using 
https://run.dlang.io/

![pic1](https://i.imgur.com/XDVOuT1.png)