bindgen max_align_t workaround can be fixed

[ghost]

In

• https://github.com/Rust-SDL2/rust-sdl2/blob/master/sdl2-sys/build.rs#L707
• https://github.com/Rust-SDL2/rust-sdl2/blob/master/sdl2-sys/build.rs#L726

it says // Until https://github.com/rust-lang-nursery/rust-bindgen/issues/550 gets fixed.
rust-lang/rust-bindgen#550 is now fixed :)

[Cobrand]

This was properly fixed recently with .rust_target(<a version that supports repr(align)>), like 1.26

Perhaps removing this line works now, but just in case we may have to look into .rust_target as the comment in this thread said.