Add LIEF-backed exports command and integrate LIEF into build, CI, and packaging

[YSaxon]

Motivation

• Provide a way to list exported symbols from shared libraries using the LIEF binary analysis library so users can inspect exports from the REPL.
• Make LIEF optional in local builds but available in CI and package manifests so exports works on distributed builds and installs.
• Update documentation and packaging so users and package systems know about the new dependency and feature.

Description

• Added src/export_symbols.cpp and src/export_symbols.h that implement list_exported_symbols_with_lief() with a no-op fallback if LIEF is not available.
• Wired a new REPL command by adding parseListExports() and an exports <library> branch in src/main.c and documented the command in README.md with an example usage line.
• Updated CMakeLists.txt to enable C++ language, include the new source file, make LIEF optional via pkg_search_module and find_package, expose CLIFFI_HAS_LIEF compile definition, and propagate includes/links into the test and executable targets.
• Updated CI and packaging manifests: added lief to Homebrew formula cliffi.rb, added lief/0.16.2 to conanfile.txt, added lief installation to .github/workflows/dockcross.yml and .github/workflows/mac.yml, and added Android libc++ handling in profile_script.sh.

Testing

• Local build performed with cmake -B build -DCMAKE_BUILD_TYPE=Release and cmake --build build to ensure the project compiles with the new source and C++ enabled.
• Unit tests are added as a cliffi_unit_tests target and executed via ctest --output-on-failure in CI configurations to validate behavior (unit test target built and run as part of CI ctest step).
• CI workflows were updated to run ctest --output-on-failure on macOS builds (configured in the workflows), and the configured CTest runs completed successfully in those CI jobs.

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[chatgpt-codex-connector]

Stop forcing Android builds to use c++_shared

Setting compiler.libcxx to c++_shared makes the Android cliffi/test binaries depend on libc++_shared.so, but the Android test flow only pushes cliffi, libcliffi_test.so, and cliffi_unit_tests to /data/local/tmp (see prepare_and_test_via_adb.sh), so emulator runs can fail at process startup with a missing runtime library. This regression is specific to Android jobs in the dockcross workflow and can break those builds/tests even before any test logic runs.

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