mysys/checksum.c:
  Cleanup
mysys/my_static.h:
  Remove not used include file
sql/item_strfunc.cc:
  Remove 'extern' references
sql/lock.cc:
  Remove 'extern' references
sql/log.cc:
  Remove 'extern' references
sql/mysql_priv.h:
  Add 'extern' references
sql/net_serv.cc:
  Added comment
sql/repl_failsafe.cc:
  Remove 'extern' references
sql/set_var.cc:
  Remove 'extern' references
sql/sql_derived.cc:
  Remove 'extern' references
sql/sql_insert.cc:
  Remove 'extern' references
sql/sql_parse.cc:
  Remove 'extern' references
sql/sql_prepare.cc:
  Remove 'extern' references
sql/sql_repl.cc:
  Remove 'extern' references
sql/sql_string.cc:
  Added comment
sql/sql_table.cc:
  Remove 'extern' references
sql/sql_test.cc:
  Remove 'extern' references
sql/sql_yacc.yy:
  Remove 'extern' references
sql/table.cc:
  Remove 'extern' references