Log Message:
mlterm: update to 3.8.8.

pkgsrc changes:
- handle utmp option properly
- remove a patch applied in the upstream

Upstream changes noted in doc/en/ReleaseNote:

ver 3.8.8
* Support Haiku OS. (Experimental)
  (Execute ./configure with --with-gui=beos option.) (See doc/en/README.beos)
* Support "[font family]:style=..." format in aafont or font-fb config \ 
file.
* Support mosh. (Experimental) (See doc/en/README.mosh)
  (Don't distribute libptymosh in binary format.)
* Clear a window and scroll out all lines if the size of a window decreases
  and some characters in it disappear.
* Support "%s" (replaced by selected strings) in \ 
"exesel:..." in ~/.mlterm/key.
* Add local_echo_wait / --lew option.
* Remove libind_tamil.so because it is very buggy.
* Change the default shortcut key of INSERT_SELECTION from Shift+Insert to
  Command+v on MacOSX and iOS.
* Skip \r in configuration files.
* Start scp by Shift+Drag&Drop on not only xlib and win32 but also wayland, sdl2
  and cocoa. (Command+Drag&Drop on cocoa.)
* Change the default value of "font_size_range" option from 6-30 to 1-100.
* Add vte 0.56.0 API symbols to libvte compatible library.
* Bug fixes:
  Fix https://sourceforge.net/p/mlterm/mailman/message/36472061/
  Fix https://sourceforge.net/p/mlterm/mailman/message/36513313/
  Fix https://sourceforge.net/p/mlterm/bugs/79/
  Fix segfault in processing illegal sixel sequence.
  Fix invalidation of DECDWL on cairo. (Enbugged at 3.8.6)
  Fix handling ISCII fonts on cairo and xft. (Improve showing bengali characters.)
  Fix screen corruption (http://twitter.com/Cj_bc_sd/status/1088111309223161857)
  on MacOSX 10.14. (Thanks to @Cj_bc_sd)
  Fix segfault in showing an input method window. (Thanks to @isaki68k)