message: avif-decoder: Convert directly to RGBA
  introduced a byte swap
  conversion from BGRA to RGBA, which can be eliminated if we ask dcp to
  convert directly to RGBA.
diff: @@ -112,7 +112,7 @@ impl<'a, R: 'a + Read> ImageDecoder<'a> for AvifDecoder<R> {
  num_planes: 3,
  };
  let dst_format = dcp::ImageFormat {
  - pixel_format: dcp::PixelFormat::Bgra,
  + pixel_format: dcp::PixelFormat::Rgba,
  color_space: dcp::ColorSpace::Lrgb,
  num_planes: 1,
  };
  @@ -160,11 +160,6 @@ impl<'a, R: 'a + Read> ImageDecoder<'a> for AvifDecoder<R> {
  }
  }
  - // Convert Bgra to Rgba
  - for chunk in buf.chunks_exact_mut(4) {
  - chunk.swap(0, 2);
  - }
  -
  Ok(())
  }
  }
  