cmake EVENT__HAVE_SYS_EVENTFD_H examples

GreatSQL/GreatSQL extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :468 

CHECK_INCLUDE_FILE(sys/eventfd.h EVENT__HAVE_SYS_EVENTFD_H)

percona/percona-server extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :476 

CHECK_INCLUDE_FILE(sys/eventfd.h EVENT__HAVE_SYS_EVENTFD_H)

facebook/mysql-5.6 extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :468 

CHECK_INCLUDE_FILE(sys/eventfd.h EVENT__HAVE_SYS_EVENTFD_H)

nmathewson/libevent_obsolete CMakeLists.txt :322 

CHECK_INCLUDE_FILE(sys/eventfd.h EVENT__HAVE_SYS_EVENTFD_H)

polardb/polardbx-engine extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :468 

CHECK_INCLUDE_FILE(sys/eventfd.h EVENT__HAVE_SYS_EVENTFD_H)

fluent/fluent-bit lib/monkey/mk_core/deps/libevent/CMakeLists.txt :276 

CHECK_INCLUDE_FILE(sys/eventfd.h EVENT__HAVE_SYS_EVENTFD_H)

percona/percona-xtradb-cluster extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :468 

CHECK_INCLUDE_FILE(sys/eventfd.h EVENT__HAVE_SYS_EVENTFD_H)