fix panic render_ex (#1505)

Author: jagprog5

sdl2-sys/build.rs

@@ -657,6 +657,8 @@ fn generate_bindings(target: &str, host: &str, headers_paths: &[String]) {
     let mut bindings = bindgen::Builder::default()
         // enable no_std-friendly output by only using core definitions
         .use_core()
+        .bitfield_enum("SDL_RendererFlip")
+        .newtype_enum("SDL_Keymod")
         .default_enum_style(bindgen::EnumVariation::Rust {
             non_exhaustive: false,
         })