message: Remove std::fs::read_to_string reimplementation
diff: // See the License for the specific language governing permissions and
  // limitations under the License.
  use std::collections::HashMap;
  -use std::fs::File;
  +use std::fs;
  use std::hash::BuildHasherDefault;
  -use std::io::{self, Read};
  +use std::io;
  use std::mem::size_of;
  use std::path::PathBuf;
  use std::ptr;
  @@ -1321,7 +1321,7 @@ fn create_shader(
  let source = if let Some(src) = source {
  src
  } else {
  - from_disk = read_file(path)?;
  + from_disk = fs::read_to_string(path)?;
  &from_disk[..]
  };
  @@ -1400,14 +1400,6 @@ fn get_shader_info_log(shader: GLuint) -> String {
  String::from_utf8(buf).unwrap()
  }
  -fn read_file(path: &str) -> Result<String, io::Error> {
  - let mut f = File::open(path)?;
  - let mut buf = String::new();
  - f.read_to_string(&mut buf)?;
  -
  - Ok(buf)
  -}
  -
  #[derive(Debug)]
  pub enum ShaderCreationError {
  /// Error reading file
  