Log Message:
Update mecab to 0.97.

Pkgsrc changes:
* fix some pkglint warining
* add DESTDIR support.

Changes:
* Fix a bug of exclusive control when dictionary is opened in MultiThreading \ 
environment.
* When installing the Windows version, it came to be able to specify the \ 
character-code of the dictionary.
* Fix a problem that was not able to be compiled correctly by some compilers.
* Add API that changes partial, analytical mode (Tagger::set_partial())
* Add API that changes generation level of lattice (Tagger::set_lattice_level())
* Add API that changes temperature parameter (Tagger::set_theta())
* Add API that changes all candidate output mode (Tagger::set_all_morphs())