Log Message:
libthai: updated to 0.1.27

LibThai 0.1.27:
* Fix another reproducibility issue in the generated documentation,
  caught by Debian Reproducible.
* Updated word break dictionary.

LibThai 0.1.26:
* Updated word break dictionary.

LibThai 0.1.25:
* New word break APIs for more thread-safety.
* Fix compilation error and warning with GCC 6.
* Do not test word breaking if dictionary is disabled.
* Updated word break dictionary.

LibThai 0.1.24:
* Fix infinite loop caused by optimization in previous version.
* Updated word break dictionary.

LibThai 0.1.23:
* Correctly check doxygen version on configure.
* Threadsafe word breaking.
* Improve word breaking performance by 0.1%
  (About 0.28% when used with libdatrie 0.2.10)
* Updated word break dictionary.

LibThai 0.1.22:
* Updated word break dictionary.
* Improve word breaking performance by 0.38%
* No timestamp on Doxygen-generated doc