Log Message:
libdatrie: updated to 0.2.11

0.2.11:
- Detect iconv() error more correctly in trietool.
- Clarify package description that search time is O(m), where m is
  key length, not O(1), while still claiming that it's independent
  of database size.
- Fix trie_state_get_data() on a prefix key.
- Fix reported segfault on full-range alpha map.