Flatpak misconfig 'object_getClass' not found

[Alexandru Ermicioi]

Hi everyone,

I've recently installed ldc with vscodium through flatpak, and 
I'm hitting following error:

```
Runtime function `object_getClass` was not found
     in (!this.empty)
```

It seems this error only trips at function preconditions inside 
interface.

Any idea what might be the issue?

Notably, if I compile same source code on host machine, 
everything is fine.

Thanks for help.