function autoOrient () {
  this.options.input.autoOrient = true;
  return this;
}
Auto-orient based on the EXIF `Orientation` tag, then remove the tag.
Mirroring is supported and may infer the use of a flip operation.

Previous or subsequent use of `rotate(angle)` and either `flip()` or `flop()`
will logically occur after auto-orientation, regardless of call order.

@example
const output = await sharp(input).autoOrient().toBuffer();

@example
const pipeline = sharp()
  .autoOrient()
  .resize(null, 200)
  .toBuffer(function (err, outputBuffer, info) {
    // outputBuffer contains 200px high JPEG image data,
    // auto-oriented using EXIF Orientation tag
    // info.width and info.height contain the dimensions of the resized image
  });
readableStream.pipe(pipeline);

@returns {Sharp}