rd_kafka_metadata defines both struct and function

[baumgold]

The rd_kafka_metadata name in rdkafka.h seems to define both a struct and a function, which causes problems (here) when trying to use Clang.jl to wrap the c-library into a Julia library. I believe we should modify the struct definition such that rd_kafka_metadata is changed to rd_kafka_metadata_s to be consistent with typedef in other parts of the codebase.. Does this make sense? If so I can create an issue/PR to make the change. Thanks!

typedef struct rd_kafka_metadata_s {
        int         broker_cnt;     /**< Number of brokers in \p brokers */
        struct rd_kafka_metadata_broker *brokers;  /**< Brokers */

        int         topic_cnt;      /**< Number of topics in \p topics */
        struct rd_kafka_metadata_topic *topics;    /**< Topics */

        int32_t     orig_broker_id;   /**< Broker originating this metadata */
        char       *orig_broker_name; /**< Name of originating broker */
} rd_kafka_metadata_t;

[edenhill]

Yeah that was a mistake not to name it rd_kafka_metadata_s, but we can't really change it now since it would break backwards compatibility with existing applications that are using the struct rather than the typedef.

But ultimately I think this is a problem with Clang.jl.