Log Message:
Update skf to 1.99.4.

skf (1.99.4) Sun, 21 Apr 2013 20:24:34 +0900

  * fix in-place suffix stores uninitialized heap area.
  * fix 1.93.3 remaining debug routine
  * fix katakana-zen-han conversion bug
  * utf-16be doesn't properly set default endian.