InnoDB 1.1.2 was released with MySQL 5.5.6-rc

interface related change, will put back in once gain approval.

It was needed when InnoDB Plugin was distributed independently of MySQL.
Approved by Vasil Dimov.

In early development of delete buffering, we did allow B-tree pages
to become empty as a result of buffered deletes. That caused fundamental
problems. The fix was to refuse buffering purge operations unless
the page can be guaranteed to be nonempty. Remove an attempt to
cope with empty pages when merging inserts.

This was replaced with REC_OLD_INFO_BITS in MySQL 5.0.3.