MDEV-34313 WITHOUT_SERVER/WSREP postfix

Mismatched IF/ENDIF statements in cmake caused a warning.

Author: grooverdan

cmake/wsrep.cmake

@@ -69,4 +69,4 @@ ENDIF()
 IF (NOT WIN32)
  ADD_FEATURE_INFO(WSREP WITH_WSREP "WSREP replication API (to use, e.g. Galera Replication library)")
 ENDIF()
-ENDIF(NOT WITHOUT_SERVER)
+ENDIF(WITHOUT_SERVER)