Remove X11 and Wayland specific items from pregenerated bindings

other less impactful changes:
- Remove unused aliases to integer types from bindings
- Update bindings
- Refactor sdl2-sys/build.rs
- Add `update_pregenerated_bindings` now that pregenerated bindings are
  different. (include no X11 and Wayland specific items anymore)

Author: antonilol

changelog.md

@@ -3,6 +3,8 @@ when upgrading from a version of rust-sdl2 to another.
 
 ### v0.39.0
 
+[PR #1516](https://github.com/Rust-SDL2/rust-sdl2/pull/1516) **BREAKING CHANGE** Remove X11 and Wayland specific items from pregenerated bindings. Use bindgen (`use-bindgen` feature flag) if those bindings are needed. Remove unused aliases to integer types and update bindings.
+
 [PR #1507](https://github.com/Rust-SDL2/rust-sdl2/pull/1507) **BREAKING CHANGE** Add binding for `SDL_ComposeCustomBlendMode`. This should only be a breaking change for users relying on internal details of `BlendMode` and `SDL_BlendMode`.
 
 [PR #1510](https://github.com/Rust-SDL2/rust-sdl2/pull/1510) Fix clippy warnings.

sdl2-sys/Cargo.toml

@@ -10,7 +10,7 @@ categories = ["rendering","external-ffi-bindings","game-engines","multimedia"]
 license = "MIT AND Zlib"
 links = "SDL2"
 build = "build.rs"
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "sdl2_sys"
@@ -41,7 +41,6 @@ optional = true
 
 [build-dependencies]
 version-compare = "0.1"
-cfg-if = "^1.0"
 
 [features]
 
@@ -59,4 +58,4 @@ ttf = []
 gfx = []
 
 [lints.rust]
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(mac_framework)','cfg(ios_framework)'] }
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(mac_framework)','cfg(ios_framework)','cfg(update_pregenerated_bindings)'] }