Update mlterm to 3.4.1.

pkgsrc changes:
- remove post-3.4.1 fix

Changed noted in doc/en/ReleaseNote:

ver 3.4.1
* Update unicode properties to 7.0.0.
* Automatically select an appropriate character set in selecting font on mlconfig
  according to a selected character encoding.
* Add "Blink cursor" and "Log" entries to "Others" tab of mlconfig.
* Add "Color" tab which customizes cursor colors , vt 16 colors and so on to mlconfig.
* Add "Font policy" and "Box drawing font" entries to "Font" tab of mlconfig.
* Support OSC 5380;color:key and OSC 5381;color:key.
* 'mlcc color [color name]' returns current rgb of specified colors.
* Bug fixes:
  SF Bug #72 (Thanks to http://sf.net/u/p2all)
  Fix a bug which disabled "\x1b]5381;/dev/...;pty_name\x07". (enbugged at 3.3.8)
  Fix "is_auto_encoding" of OSC 5379 which didn't work.
  Fix a bug which disabled "xft" checkbox of mlconfig.
  Revive "New" button in "PTY List" of mlconfig.

(tsutsui)