WL#5030: Split and remove mysql_priv.h

This patch:

- Moves all definitions from the mysql_priv.h file into
  header files for the component where the variable is
  defined
- Creates header files if the component lacks one
- Eliminates all include directives from mysql_priv.h
- Eliminates all circular include cycles
- Rename time.cc to sql_time.cc
- Rename mysql_priv.h to sql_priv.h

sql/sql_update.h

@@ -0,0 +1,43 @@
+/* Copyright 2006-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
+
+#ifndef SQL_UPDATE_INCLUDED
+#define SQL_UPDATE_INCLUDED
+
+#include "sql_class.h"                          /* enum_duplicates */
+
+class Item;
+class TABLE_LIST;
+class THD;
+
+typedef class st_select_lex SELECT_LEX;
+typedef class st_select_lex_unit SELECT_LEX_UNIT;
+
+bool mysql_prepare_update(THD *thd, TABLE_LIST *table_list,
+                          Item **conds, uint order_num, ORDER *order);
+int mysql_update(THD *thd,TABLE_LIST *tables,List<Item> &fields,
+		 List<Item> &values,COND *conds,
+		 uint order_num, ORDER *order, ha_rows limit,
+		 enum enum_duplicates handle_duplicates, bool ignore,
+                 ha_rows *found_return, ha_rows *updated_return);
+bool mysql_multi_update(THD *thd, TABLE_LIST *table_list,
+                        List<Item> *fields, List<Item> *values,
+                        COND *conds, ulonglong options,
+                        enum enum_duplicates handle_duplicates, bool ignore,
+                        SELECT_LEX_UNIT *unit, SELECT_LEX *select_lex,
+                        multi_update **result);
+bool compare_record(TABLE *table);
+
+#endif /* SQL_UPDATE_INCLUDED */