Bug #25075: sql_class.cc doesn't compile with --without-query-cache

Wrap query_cache_init_query() call with #ifdef HAVE_QUERY_CACHE in THD::THD()

sql/sql_class.cc

@@ -224,7 +224,9 @@ THD::THD()
 #endif
   client_capabilities= 0;                       // minimalistic client
   net.last_error[0]=0;                          // If error on boot
+#ifdef HAVE_QUERY_CACHE
   query_cache_init_query(&net);                 // If error on boot
+#endif
   ull=0;
   system_thread= cleanup_done= abort_on_warning= no_warnings_for_error= 0;
   peer_port= 0;					// For SHOW PROCESSLIST