Log Message:
Update KAKASI to 2.3.6.
(in addtion to backported patches, dropped prototype patch of kakasi_do().
 Its committer doesn't know the reason anymore, and implemented part patches
 had been merged long time ago with
   "patch-aa and patch-ac patched the same file.  Merge them"
 but patch-aa was for lib/libkakasi.c, and patch-ac is for src/kakasi.c.
 From no problem reportes, it is considered this patch set is not relevant).

Changes from KAKASI 2.3.5 to 2.3.6

* Check runtime environment for test codes, and skip impossible tests.

* With configure, check compiler supported option.
  (for the issue old gcc cannot accept -Wno-unused-result option)

* Fixed to check iconv availability at configure instead of autconf.

* Fixed and added manual (by Osamu Aoki).

* Fixed a bug to ouput redundant delimiter at wakatigaki if the line
  start with ASCII character.

* Changed unitptr_t from macro to typedef (to avoid the issue that
  come compilers cannot handle such macro)

* Fixed missing iconv related casts.

Changes from KAKASI 2.3.4 to 2.3.5

* Added UTF-8 input/output support (iconv is required)

* Improve handling of japanese long-vowel.

* Fixed bug of do_kakasi(), may return invald memory area.

* Fixed a wrong entriy in kakasidict.

* Fixed bad hepburn romaji table.

* Added use_old_romaji_table variable and -t option.

* Fixed segfault on invalid SS2 sequences.

* Fixes warnings at compile.

* Added a test script.

* Added -S option for mutable separator (with -w or -s option).

* Added -l and -L option for level furigana and hiragana conversion.
  (See doc/README.level for more information)

* Newly added -F option for mutable parentheses around furigana
  (with -JH -f or -L option).

* Added -y option to display all yomi per one Kanji.

* Add endian independent dictionary format support.

* Fixed bad hepburn romaji table.
  (specify -t option fo use  old romaji table)