cmake EVENT__HAVE_STDDEF_H examples

GreatSQL/GreatSQL extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :461 

CHECK_INCLUDE_FILE(stddef.h EVENT__HAVE_STDDEF_H)

percona/percona-server extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :469 

CHECK_INCLUDE_FILE(stddef.h EVENT__HAVE_STDDEF_H)

facebook/mysql-5.6 extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :461 

CHECK_INCLUDE_FILE(stddef.h EVENT__HAVE_STDDEF_H)

nmathewson/libevent_obsolete CMakeLists.txt :315 

CHECK_INCLUDE_FILE(stddef.h EVENT__HAVE_STDDEF_H)

polardb/polardbx-engine extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :461 

CHECK_INCLUDE_FILE(stddef.h EVENT__HAVE_STDDEF_H)

fluent/fluent-bit lib/monkey/mk_core/deps/libevent/CMakeLists.txt :269 

CHECK_INCLUDE_FILE(stddef.h EVENT__HAVE_STDDEF_H)

percona/percona-xtradb-cluster extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :461 

CHECK_INCLUDE_FILE(stddef.h EVENT__HAVE_STDDEF_H)