Merge pull request #26590 from Kumataro:fix26589

Support C++20 standard #26590

Close https://github.com/opencv/opencv/issues/26589
Related https://github.com/opencv/opencv_contrib/pull/3842
Related: https://github.com/opencv/opencv/issues/20269

- do not arithmetic enums and ( different enums or floating numeric) 
- remove unused variable

### Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [x] There is a reference to the original bug report and related work
- [x] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/imgproc/src/templmatch.cpp

@@ -1056,7 +1056,7 @@ static bool ipp_crossCorr(const Mat& src, const Mat& tpl, Mat& dst, bool normed)
     if (ippiCrossCorrNorm==0)
         return false;
 
-    IppEnum funCfg = (IppEnum)(ippAlgAuto | ippiROIValid);
+    IppEnum funCfg = (IppEnum)(+ippAlgAuto | ippiROIValid);
     if(normed)
         funCfg |= ippiNorm;
     else
@@ -1093,7 +1093,7 @@ static bool ipp_sqrDistance(const Mat& src, const Mat& tpl, Mat& dst)
     if (ippiSqrDistanceNorm==0)
         return false;
 
-    IppEnum funCfg = (IppEnum)(ippAlgAuto | ippiROIValid | ippiNormNone);
+    IppEnum funCfg = (IppEnum)(+ippAlgAuto | ippiROIValid | ippiNormNone);
     status = ippiSqrDistanceNormGetBufferSize(srcRoiSize, tplRoiSize, funCfg, &bufSize);
     if ( status < 0 )
         return false;