[CMake] Fix RPATH issues in build system

[zacharyvincze]

Changes

• Explicitly set build/install RPATHs for targets so that LD_LIBRARY_PATH is not a requirement.
• Move OpenMP dependency to private for roccv target.
• Organize bin and lib folders in build tree.

[Copilot]

Pull request overview

This PR updates rocCV’s CMake packaging/build configuration to improve in-tree runnable artifacts (tests/samples/benchmarks/python module) by standardizing output directories and setting build/install RPATHs, while also tightening roccv’s exported dependency surface.

Changes:

• Standardize runtime/library output locations for tests, samples, benchmarks, and the Python module.
• Add/adjust BUILD_RPATH and INSTALL_RPATH to improve runtime library discovery (especially for ROCm/LLVM libs).
• Make OpenMP a private dependency of roccv and expose C++20 via target compile features; add roccv_VERSION in the package config.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tests/roccv/cpp/CMakeLists.txt	Redirect test executables to bin/tests/... and add build RPATH.
src/CMakeLists.txt	Make OpenMP private, publish C++20 requirement, and revise build/install RPATHs for libroccv.
samples/CMakeLists.txt	Set samples output dir and build RPATH in the sample helper function.
samples/cropandresize/cpp/CMakeLists.txt	Set sample app output dir and build RPATH.
benchmarks/CMakeLists.txt	Set benchmark output dir and build RPATH.
python/CMakeLists.txt	Set python module output dir and adjust build/install RPATH.
cmake/roccvConfig.cmake.in	Export roccv_VERSION and remove OpenMP as a transitive dependency.
CHANGELOG.md	Mark 0.5.0 as “Unreleased” and document OpenMP visibility change.

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[simonCatBot]

Review: [CMake] Fix RPATH issues in build system

This PR improves the build system configuration:

Changes:

• Explicit RPATH settings so LD_LIBRARY_PATH is not required
• OpenMP moved to private linkage for roccv target
• Better organization of bin/lib folders

Assessment: LGTM - Build system improvements are always welcome.

Proper RPATH handling makes the library more portable and easier to use. Moving OpenMP to private linkage is correct - consumers should not need to link it transitively. Would benefit from CI testing on different Linux distributions to ensure the RPATH logic works across environments.