shogun: fix darwin build (#453328)

    sed -i -e 's/#if USE_SVMLIGHT/#ifdef USE_SVMLIGHT/' src/interfaces/swig/Machine.i

    sed -i -e 's@// USE_SVMLIGHT@//USE_SVMLIGHT@' src/interfaces/swig/Transfer.i

    sed -i -e 's@/\* USE_SVMLIGHT \*/@//USE_SVMLIGHT@' src/interfaces/swig/Transfer_includes.i

    # Fix build with CMake 4

    substituteInPlace CMakeLists.txt \

      --replace-fail "cmake_minimum_required(VERSION 3.1)" "cmake_minimum_required(VERSION 3.5)"

    # Patch rxcpp to build with CMake 4 and GCC 14

    rxcpp_tmpdir=$(mktemp -d)

    tar -xzf third_party/rxcpp/v${rxcppVersion}.tar.gz -C "$rxcpp_tmpdir"

    rm third_party/rxcpp/v${rxcppVersion}.tar.gz

    find "$rxcpp_tmpdir/RxCpp-${rxcppVersion}" -type f -name "CMakeLists.txt" -exec \

      sed -i -E 's/cmake_minimum_required\(VERSION.*\)/cmake_minimum_required\(VERSION 3.5\)/g' {} +

    substituteInPlace "$rxcpp_tmpdir/RxCpp-${rxcppVersion}/Rx/v2/src/rxcpp/rx-notification.hpp" \

      --replace-fail "{ ep = std::move(o.ep); return *this; }" "RXCPP_DELETE;"

    tar -czf third_party/rxcpp/v${rxcppVersion}.tar.gz -C "$rxcpp_tmpdir" RxCpp-${rxcppVersion}

    rxcpp_hash=$(md5sum third_party/rxcpp/v${rxcppVersion}.tar.gz | awk '{ print $1 }')

    substituteInPlace cmake/external/rxcpp.cmake \

      --replace-fail "feb89934f465bb5ac513c9adce8d3b1b" "$rxcpp_hash"

    # Patch gtest to build with CMake 4

    gtest_tmpdir=$(mktemp -d)

    tar -xzf third_party/GoogleMock/release-${gtestVersion}.tar.gz -C "$gtest_tmpdir"

    rm third_party/GoogleMock/release-${gtestVersion}.tar.gz

    find "$gtest_tmpdir/googletest-release-${gtestVersion}" -type f -name "CMakeLists.txt" -exec \

      sed -i -E 's/cmake_minimum_required\(VERSION.*\)/cmake_minimum_required\(VERSION 3.5\)/g' {} +

    tar -czf third_party/GoogleMock/release-${gtestVersion}.tar.gz -C "$gtest_tmpdir" googletest-release-${gtestVersion}

    gtest_hash=$(md5sum third_party/GoogleMock/release-${gtestVersion}.tar.gz | awk '{ print $1 }')

    substituteInPlace cmake/external/GoogleTestNMock.cmake \

      --replace-fail "16877098823401d1bf2ed7891d7dce36" "$gtest_hash"

  ''

  + lib.optionalString (!withSvmLight) ''

    # Run SVMlight scrubber