Log Message:
mlterm: update to 3.9.1.

pkgsrc changes:

- remove a patch applied in the upstream
- pull an upstream fix for NetBSD/x68k VGA mode support:
 https://github.com/arakiken/mlterm/commit/0d3a3b0bdc36ee2d702167fd234dcfc3c500ac09

Upstream changes noted in doc/en/ReleaseNote:

ver 3.9.1
* Support copy mode which starts by Control+Shift+Return.
* Support OSC 1337;Setmark ST.
* Support CSI 3 J (ED) which clears backlog.
* Support gradle to build mlterm for Android. (See doc/en/README.android)
* Add --enable-utmp-suid option to ./configure script.
  (The default value is disabled.)
* Add --with-utmp option which specifies the way of accessing to utmp database
  to ./configure script.
* Add SCROLL_UP_TO_MARK, SCROLL_DOWN_TO_MARK and SET_MARK shortcut keys.
* Add resize_mode / --rz option, and drop scroll_on_resize / --sr option.
  (If you want to revert to the old behavior, specify --rz=none option.)
* Add emoji_file_format / --emojifmt option.
* Add libvterm 0.1 API symbols to libvterm compatible library.
* Add vte 0.62 API symbols to libvte compatible library.
* Drop SCROLL_DOWN and PAGE_DOWN shortcut keys.
* Drop use_extended_scroll_shortcut option and SCROLL_UP shortcut key is enabled
  by default. (If you want to disable it, add UNUSED=SCROLL_UP to ~/.mlterm/key.)
* Update unicode property table (generated from UnicodeData.txt and
  EastAsianWidth.txt) to version 13.0.0.
* letter_space / --csp option accepts negative value.
* libvte compatible library supports XInput2.
* Bug fixes:
  Fix a bug which caused a 'mlimgloader' process not to exit after loading a \ 
wall picture.
  (Enbugged at 3.8.8)
  Fix a bug which disabled keyboard and mouse on Haiku R1/beta2.
  Mlconfig starts correctly by Ctrl + RightClick on cygwin 3.1.4.
  Fix https://sourceforge.net/p/mlterm/mailman/message/37033060/
  Fix segfault of mlcc in exiting after changing configurations.
  Fix segfault in double click at RTL characters. (Enbugged at 3.6.2)
  Fix corruption of data transferred by "OSC 5379; scp ... ST".
  Fix https://github.com/arakiken/mlterm/issues/4.
  Fix	http://twitter.com/oshimyja/status/1320251099211649024.