[Bug d/95198] [D] extern(C) private final functions should use 'local' linker attribute

[witold.baryluk+gcc at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95198

--- Comment #1 from Witold Baryluk <witold.baryluk+gcc at gmail dot com> ---
BTW.

Using:

```
extern(C) private final static int f() { ... }
```


doesn't change anything.