Problem: reading/writing data from/to an address without proper
alignment leads to SIGBUS on some platforms.

Fix: use the correct data type when dereferencing variable values.


sql/sql_plugin.cc:
  Fix for bug#37669: Server crash by setting "@@session.innodb_table_locks"
  
  Use *(my_bool *) typecast to avoid misaligned reading/writing and 
  to get/set proper boolean values.