Use bindbc-sdl statically

[Mike Parker]

On Saturday, 24 April 2021 at 16:13:12 UTC, russhy wrote:


>
> also you are missing the
>
> ```
> subConfigurations "bindbc-sdl" "staticBC"
> ```

That's not necessary when the version `BindSDL_Static` is 
provided. The `static` and `staticBC` subconfigurations both 
enable `-version=BindSDL_Static`, and `staticBC` is only required 
when you want to compile as a static binding with `-betterC`.