Log Message:
Update libdatrie to 0.2.2.

0.2.2 (2009-04-29)
=====
- Support building with linkers without symbol versioning supports,
  including Mac, Cygwin, MinGW.
- Support other iconv implementations than that's in glibc, for Mac and MinGW.

0.2.1 (2009-04-05)
=====
- Fix errors in documentation
- Symbol versioning to ease upgrade across SONAME
- Minor cleanups

0.2.0 (2009-03-24)
=====
- New APIs for performance: trie_state_copy(), trie_state_is_single()
- Clean-ups

0.1.99.2 (2008-12-15)
========
- More robust handling of alphabet ranges
- Allow co-existence with libdatrie0

0.1.99.1 (2008-12-12)
========
- Breaking ABI with libdatrie0
- More capacity with 32-bit node index
- Adjusted API for non-file trie usage
- All data in one file, no more *.br and *.tl split
- Drop SBTrie wrapper; all features are merged into Trie
- Domain characters are now Unicode