BUG#21842: Exclude Rows_log_event members used in event application if

not compiled as a replication server - a fix from rpl clone now applied
to 5.1.22 tree.


sql/log_event.cc:
  Exclude Rows_log_event members used in event application if 
  not compiled as a replication server.
sql/log_event.h:
  Don't initialize Rows_log_event members used in event application if 
  not compiled as a replication server.