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.

Remove non applicable licensing files

storage/innobase/COPYING is in the MySQL top level directory and
storage/innobase/COPYING.Sun_Microsystems is not applicable anymore
now that Oracle and Sun are one company.

On Solaris with version 3.4.6, the ha_example.so shared library is built
with DTrace and the server is built without DTrace support. This occurs
because dtrace.cmake disables DTrace support for 3.4.6, but still set
HAVE_DTRACE, which causes probes_mysql.h to include probes_mysql_dtrace.h
instead of probes_mysql_nodtrace.h.

This patch fixes this by not setting HAVE_DTRACE on Solaris for GCC 3.4.6.

 create data dir correctly in initial_database target on Windows
 handle case where INSTALL_MYSQLTESTDIR is empty (e.g someone does not want
 to install tests)