Possible solution for #425

[drlsdee]

Resolves #425

In win32\win32_config.h:

• added version check for librdkafka;
• if the version >= 0x00090100, sets ENABLE_KAFKACONSUMER to 1;
• otherwise sets ENABLE_KAFKACONSUMER to 0.
• also added definitions for LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO and LOG_DEBUG from syslog.h, ifndef