cmake rdkafka examples

mariadb-corporation/MaxScale CMakeLists.txt :75 

find_package(Rdkafka)

ceph/ceph src/rgw/CMakeLists.txt :451 

find_package(RDKafka 0.9.2 REQUIRED)

syslog-ng/syslog-ng modules/kafka/CMakeLists.txt :2 

find_package(rdkafka 1.1.0)