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.

include/mysql.h.pp

@@ -518,6 +518,16 @@ unsigned long mysql_real_escape_string(MYSQL *mysql,
             char *to,const char *from,
             unsigned long length);
 void mysql_debug(const char *debug);
+char * mysql_odbc_escape_string(MYSQL *mysql,
+       char *to,
+       unsigned long to_length,
+       const char *from,
+       unsigned long from_length,
+       void *param,
+       char *
+       (*extend_buffer)
+       (void *, char *to,
+        unsigned long *length));
 void myodbc_remove_escape(MYSQL *mysql,char *name);
 unsigned int mysql_thread_safe(void);
 my_bool mysql_embedded(void);