Fixed windows build break

sql/CMakeLists.txt:
  Fixed windows build break, file item_uniq.cc has been removed.

sql/CMakeLists.txt

@@ -48,7 +48,7 @@ ADD_EXECUTABLE(mysqld ../sql-common/client.c derror.cc des_key_file.cc
                hostname.cc init.cc item.cc item_buff.cc item_cmpfunc.cc 
                item_create.cc item_func.cc item_geofunc.cc item_row.cc 
                item_strfunc.cc item_subselect.cc item_sum.cc item_timefunc.cc 
-               item_uniq.cc key.cc log.cc lock.cc log_event.cc message.rc 
+               key.cc log.cc lock.cc log_event.cc message.rc 
                message.h mf_iocache.cc my_decimal.cc ../sql-common/my_time.c
                mysqld.cc net_serv.cc 
                nt_servc.cc nt_servc.h opt_range.cc opt_range.h opt_sum.cc