Log Message:
libdatrie: updated to 0.2.10

0.2.10:
- Correctly check doxygen version on configure.
- Optimization on AlphaMap mapping.
  (contributing to 0.2% less run time for LibThai word breaking)

0.2.9:
- Fix binary file opening on Windows
- Fix infinite loop on empty trie iteration.
- Micro-optimization with LIKELY/UNLIKELY hints.
  (contributing to 4.76% faster dictionary loading, 1.95% faster
  word breaking for LibThai)
- Improved error handling
- 'trietool-0.2' utility is renamed to just 'trietool'
- Improved documentation
- No timestamp on Doxygen-generated doc