Log Message:
Update nkf to 2.09.
While here, add support of self test if PKGSRC_RUN_TEST=YES,
and let p5-nkf to sync with nkf.

Changes:
 * Add -Z4 option.  Convert JIS X 0208 KANA to JIS X 0201 KANA (ZENKAKU to HANKAKU).
 * Add -g=0, -g=1, --guess=0 and --guess=1 option.
   guesses linefeed code.
 * Add some comple option.  See also config.h for more information.
 * Some bug fixes.
 * Change license from original one to zlib's one.
 * Change SCM from CVS to Git.