Macos rpath fix

[artcore-c]

Summary

This change adds MacOS-specific INSTALL_RPATH and BUILD_RPATH settings for the idlc binary to ensure dependent dynamic libraries such as:

• libiceoryx_posh.dylib
• libiceoryx_binding_c.dylib
• libiceoryx_hoofs.dylib

can be located at both build and runtime when used with ros2_rolling and colcon build.

Key points:

• Fix resolves runtime aborts from idlc during the CycloneDDS build process
• Targets MacOS only (if(APPLE))
• Ensures MACOSX_RPATH is correctly set
• Verified working on MacOS x86_64 (12.7.6 Monterey) with System Integrity Protection (SIP) enabled

Checklist

• My code builds and works on at least one target platform (MacOS x86_64)
• I have added tests to cover my changes (N/A - build system change only)
• I have updated the documentation (N/A)
• I have added a changelog entry for my changes
• I have signed the Eclipse Contributor Agreement (ECA)
• I have set the correct target branch (releases/0.10.x)
• I have updated all relevant GitHub workflows if necessary (N/A)

Testing

• Built with colcon build --symlink-install
• Part of a functional ROS 2 Rolling workspace using the ros2.repos meta file
• Confirmed that idlc executes without errors when invoked by CMake
• Apple SIP enabled throughout testing

Related Issues

• Closes: TBD
• Improves platform compatibility for MacOS users using ROS 2 with CycloneDDS tooling