catch2_3: skip test ApprovalTests on darwin

  cmakeFlags = [

    "-DCATCH_DEVELOPMENT_BUILD=ON"

    "-DCATCH_BUILD_TESTING=${if doCheck then "ON" else "OFF"}"

  ] ++ lib.optionals (stdenv.isDarwin && doCheck) [

    # test has a faulty path normalization technique that won't work in

    # our darwin build environment https://github.com/catchorg/Catch2/issues/1691

    "-DCMAKE_CTEST_ARGUMENTS=-E;ApprovalTests"

  ];

  doCheck = true;