[Saliency] Enable Java/Android bindings by adding 'WRAP java' to CMake

[Akhil-Chaturvedi]

Fixes #4016

This addresses the inability to use the saliency module in Android (Java/Kotlin) applications. When generated using build_sdk.py, the native library compiles, but the Java wrapper class (org.opencv.saliency.Saliency) is not generated.

Technical Fix:

The ocv_define_module macro in modules/saliency/CMakeLists.txt was missing the java flag in its WRAP parameter.

Change in modules/saliency/CMakeLists.txt:

OLD
ocv_define_module(saliency opencv_imgproc opencv_features2d WRAP python)

NEW
ocv_define_module(saliency opencv_imgproc opencv_features2d WRAP python java)

Pull Request Readiness Checklist

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

• I agree to contribute to the project under Apache 2 License.
• 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
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
• There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• The feature is well documented and sample code can be built with the project CMake

[asmorkalov]

@Akhil-Chaturvedi Please handle CI warnings.

[asmorkalov]

  Warning: /home/ubuntu/opencv/modules/core/include/opencv2/core.hpp:3211:26: warning: 'virtual void cv::Algorithm::write(cv::FileStorage&) const' was hidden [-Woverloaded-virtual=]
  Warning: /home/ubuntu/opencv/modules/core/include/opencv2/core.hpp:3224:26: warning: 'virtual void cv::Algorithm::read(const cv::FileNode&)' was hidden [-Woverloaded-virtual=]

[asmorkalov]

/Users/opencv-cn/GHA-OCV-1/_work/opencv_contrib/opencv_contrib/opencv_contrib/modules/saliency/src/BING/objectnessBING.cpp:456:22: error: out-of-line definition of 'read' does not match any declaration in 'cv::saliency::ObjectnessBING'
void ObjectnessBING::read()
                     ^~~~
/Users/opencv-cn/GHA-OCV-1/_work/opencv_contrib/opencv_contrib/opencv_contrib/modules/saliency/src/BING/objectnessBING.cpp:461:22: error: out-of-line definition of 'write' does not match any declaration in 'cv::saliency::ObjectnessBING'
void ObjectnessBING::write() const
                     ^~~~~

[Akhil-Chaturvedi]

@asmorkalov The Windows10-x64 job seems to have failed on a network glitch (ECONNRESET) at the very end. Could you please trigger a re-run? All other checks passed. Thanks!

[asmorkalov]

The methods are not functional and are not used in the code. I propose just remove them.