Fetch SDL development libraries automatically during installation

[ottworks]

Having manual installation procedures tends to get messy when working several levels down of dependency (ggez, in my case). Ideally, installation via crate should be fully automatic with no user action required.

[prail]

Definitely a good idea!

[Cobrand]

Ideally, installation via crate should be fully automatic with no user action required

Now that's an opinion, and a point of view that I don't share. Crates are bits of rust code first, and I feel like it should be kept this way. That's the same with other packages from other package managers; take nodejs and npm for instance, I don't think I've seen a package that would install a library automatically, it you don't have a dependency on your system, it fails. If you need a library, you must use your package manager...

Now I understand where you are coming from and this is a totally valid viewpoint, but I will allow this to be in this crate via an optional feature, and it has to be disabled by default. Pull requests are very welcome for this one, as I'm probably not going to do it myself.

[ottworks]

For the record, the rust-portaudio crate does this.

[Cobrand]

portaudio and ffmpeg are the 2 crates that I know with that state of mind, and I'm definitely not a fan of both for having tested them. On the other hand, other widely used C bindings libraries such as postgres and cairo don't do it.

sqlite3 actually has a feature "bundled" to fetch and build automatically the library on crate usage.

The last one is the best of both worlds: if you don't want to use it, then it's exactly the same as any other crate, but otherwise you can enable a feature to have the library bundled within the crate itself.

[photex]

Having been the instigator and contributor of adding the "bundled" feature to several crates, I propose the same be done for rust-sdl2.
I can start a PR and test on Windows if others can test on MacOS and Linux.

[rminderhoud]

Can close this one since #720 got merged?