Merge with MySQL 5.1, with following additions:

- Moved some code from innodb_plugin to xtradb, to ensure that all tests runs
- Did changes in pbxt and maria storage engines becasue of changes in thd->query
- Reverted wrong code in sql_table.cc for how ROW_FORMAT is used.

This is a re-commit of Monty's merge to eliminate an extra commit from
MySQL-5.1.42 that was accidentally included in the merge.

This is a merge of the MySQL 5.1.41 clone-off (clone-5.1.41-build). In
case there are any extra changes done before final MySQL 5.1.41
release, these will need to be merged later before MariaDB 5.1.41
release.

libmysql/libmysql.c

@@ -1642,6 +1642,20 @@ mysql_real_escape_string(MYSQL *mysql, char *to,const char *from,
   return (uint) escape_string_for_mysql(mysql->charset, to, 0, from, length);
 }
 
+
+char * STDCALL
+mysql_odbc_escape_string(MYSQL *mysql __attribute__((unused)),
+                         char *to __attribute__((unused)),
+                         ulong to_length __attribute__((unused)),
+                         const char *from __attribute__((unused)),
+                         ulong from_length __attribute__((unused)),
+                         void *param __attribute__((unused)),
+                         char * (*extend_buffer)(void *, char *, ulong *)
+                         __attribute__((unused)))
+{
+  return NULL;
+}
+
 void STDCALL
 myodbc_remove_escape(MYSQL *mysql,char *name)
 {