Comment 2 for bug 488040

As explained at:

http://www.collation-charts.org/articles/croatian.htm

this patch does more than just add support for Croatian UTF8 collation. It was based on Alexander's patch for mysql 5.1 (http://www.collation-charts.org/articles/utf8_croatian_ci.diff) and you could probably get it by pulling from mysql 6.