cmake EVENT__HAVE_AFUNIX_H examples

GreatSQL/GreatSQL extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :432 

CHECK_INCLUDE_FILE(afunix.h EVENT__HAVE_AFUNIX_H)

percona/percona-server extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :440 

CHECK_INCLUDE_FILE(afunix.h EVENT__HAVE_AFUNIX_H)

facebook/mysql-5.6 extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :432 

CHECK_INCLUDE_FILE(afunix.h EVENT__HAVE_AFUNIX_H)

polardb/polardbx-engine extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :432 

CHECK_INCLUDE_FILE(afunix.h EVENT__HAVE_AFUNIX_H)

percona/percona-xtradb-cluster extra/libevent/libevent-2.1.11-stable/CMakeLists.txt :432 

CHECK_INCLUDE_FILE(afunix.h EVENT__HAVE_AFUNIX_H)