This is a placeholder for the `sdl3-src` crate, which will be used by the
`sdl3-sys` crate to build the SDL library from source.
The maintainers of SDL have requested that SDL isn't distributed by third
parties until it's ABI stable, so `sdl3-src` won't be published on crates.io
until then.
In the meantime, you can follow development on github at
<https://github.com/maia-s/sdl3-sys-rs>