cmake HAVE_LIBEVENT2 examples

GreatSQL/GreatSQL plugin/innodb_memcached/daemon_memcached/CMakeLists.txt :34 

ADD_DEFINITIONS("-DHAVE_LIBEVENT2")

percona/percona-server plugin/innodb_memcached/daemon_memcached/CMakeLists.txt :35 

ADD_DEFINITIONS("-DHAVE_LIBEVENT2")

facebook/mysql-5.6 plugin/innodb_memcached/daemon_memcached/CMakeLists.txt :34 

ADD_DEFINITIONS("-DHAVE_LIBEVENT2")

polardb/polardbx-engine plugin/innodb_memcached/daemon_memcached/CMakeLists.txt :34 

ADD_DEFINITIONS("-DHAVE_LIBEVENT2")

percona/percona-xtradb-cluster plugin/innodb_memcached/daemon_memcached/CMakeLists.txt :35 

ADD_DEFINITIONS("-DHAVE_LIBEVENT2")