message: remove unnecessary build hack
  with rust 1.23.0 which is stable now, this compiler stack overflow crash not occured
  related to
diff: @@ -15,17 +15,8 @@ fn main() {
  textures::build_texture_file(&mut File::create(&dest.join("textures.rs")).unwrap());
  println!("cargo:rerun-if-changed=build/main.rs");
  -
  - // There is a `#[derive(Clone)]` line in the bindings that triggers a stack overflow
  - // in rustc (https://github.com/rust-lang/rust/issues/26467).
  - // Therefore we write the bindings to memory first, then remove this line, and then copy
  - // to the file.
  - let mut gl_bindings = Vec::new();
  - generate_gl_bindings(&mut gl_bindings);
  - let gl_bindings = String::from_utf8(gl_bindings).unwrap();
  - let gl_bindings = gl_bindings.replace("#[derive(Clone)]", "");
  let mut file_output = File::create(&dest.join("gl_bindings.rs")).unwrap();
  - file_output.write_all(&gl_bindings.into_bytes()).unwrap();
  + generate_gl_bindings(&mut file_output);
  }
  fn generate_gl_bindings<W>(dest: &mut W) where W: Write {
  