Upgrade SDL version of bundled feature

[joao-conde]

SDL2.0.12 currently used by the bundled feature is bugged.

Running a profiler on my code using this crate:

This WIN_UpdateCursorClip and SDL_POLL_EVENT were super slow. I had this in my main game loop:

while let Some(event) = event_pump.poll_event() {
      match event {
          sdl2::event::Event::Quit { .. } => break 'main,
          sdl2::event::Event::KeyDown {
            keycode: Some(Keycode::Escape),
                  ..
           } => break 'main,
           _ => {}
      }
}

I commented out event processing and it runs at normal speed.

Further investigated and stumbled upon this: https://stackoverflow.com/questions/58639564/why-is-sdl-pollevent-so-slow
Seems however it was fixed in 2.0.14: libsdl-org/SDL#3717

Hence, I propose the bundled feature should download SDL2.0.14

Point me to relevant code and I can open the PR myself if need be :)

[Cobrand]

I am pretty sure someone mentioned this exact same issue in the past for 2.0.12, but I can't find it anymore... They proposed we either revert to 2.0.10 or upgrade to 2.0.14 too...

Regardless, you are more than welcome to create the relevant PR.

Relevant code to change: https://github.com/Rust-SDL2/rust-sdl2/blob/master/sdl2-sys/build.rs#L26

You may have to look into this as well: https://github.com/Rust-SDL2/rust-sdl2/blob/master/sdl2-sys/build.rs#L176 , there were several patches that were specific to 2.0.12 that may not apply to 2.0.14 anymore, so you may have to remove them as well.

[joao-conde]

Do you prefer to downgrade it to 2.0.10 or upgrade it?

[joao-conde]

Solved by #1086