Function is_bool_arg

subprojects/llama.cpp/common/preset.cpp:283–285

}

static bool is_bool_arg(const common_arg & arg) {
    return !arg.args_neg.empty();
}

static std::string parse_bool_arg(const common_arg & arg, const std::string & key, const std::string & value) {
    // if this is a negated arg, we need to reverse the value