cmake DFB_HAVE_WSENV examples

GreatSQL/GreatSQL storage/rocksdb/CMakeLists.txt :305 

ADD_DEFINITIONS(-DFB_HAVE_WSENV=1)

percona/percona-server storage/rocksdb/CMakeLists.txt :291 

ADD_DEFINITIONS(-DFB_HAVE_WSENV=1)

facebook/mysql-5.6 storage/rocksdb/CMakeLists.txt :145 

ADD_DEFINITIONS(-DFB_HAVE_WSENV=1)

percona/percona-xtradb-cluster storage/rocksdb/CMakeLists.txt :267 

ADD_DEFINITIONS(-DFB_HAVE_WSENV=1)