message: Add workaround for the non-detectable missing QUIRC support in OpenCV from the Ubuntu 20.04 repo
diff: use std::path::Path;
  use opencv::{
  + core,
  imgcodecs,
  objdetect,
  prelude::*,
  @@ -14,16 +15,24 @@ use opencv::{
  fn qr_code() -> Result<()> {
  let qr_path = Path::new(env!("CARGO_MANIFEST_DIR")).join("tests/qr.png");
  + // workaround for the missing (and not runtime detectable) QUIRC support in repository OpenCV in Ubuntu 20.04
  + let objdetect_missing_quirc = cfg!(target_os = "linux") && core::get_build_information()?.contains("/opencv-4.2.0+dfsg/");
  +
  {
  let mut detector = objdetect::QRCodeDetector::default()?;
  let src = imgcodecs::imread(qr_path.to_str().unwrap(), imgcodecs::IMREAD_COLOR)?;
  let mut pts = VectorOfPoint::new();
  let mut straight = Mat::default();
  let res = detector.detect_and_decode(&src, &mut pts, &mut straight)?;
  - assert_eq!(res, "https://crates.io/crates/opencv");
  assert_eq!(4, pts.len());
  + if objdetect_missing_quirc {
  + assert_eq!(res, "");
  + assert!(straight.empty());
  + } else {
  + assert_eq!(res, "https://crates.io/crates/opencv");
  assert!(!straight.empty());
  }
  + }
  {
  let mut detector = objdetect::QRCodeDetector::default()?;
  @@ -34,9 +43,14 @@ fn qr_code() -> Result<()> {
  assert_eq!(4, pts.len());
  let mut straight = Mat::default();
  let res = detector.decode(&src, &pts, &mut straight)?;
  + if objdetect_missing_quirc {
  + assert_eq!(res, "");
  + assert!(straight.empty());
  + } else {
  assert_eq!(res, "https://crates.io/crates/opencv");
  assert!(!straight.empty());
  }
  + }
  #[cfg(ocvrs_opencv_branch_34)] {
  let src = imgcodecs::imread(qr_path.to_str().unwrap(), imgcodecs::IMREAD_COLOR)?;
  