Log Message:
Update mlterm to 3.6.3.

pkgsrc changes:
 - use pre-configure rather than post-patch for SUBST_STAGEs to make
   mkpatches(1) and patchdiff(1) easier (suggested by jperkin@)
 - add otl options
 - enable m17nlib and the new otl options by default
 - explicitly add --enable-anti-alias to CONFIGURE_ARGS for mlterm-fb
 - sort PLIST

Changes noted in doc/en/ReleaseNote:

ver 3.6.3
* Bug fixes:
  Fix compiling error when ./configure is executed with
  "--with-gui=fb (--disable-anti-alias)" or
  "--with-gui=xlib,fb --enable-anti-alias" option.

ver 3.6.2
* Support composition of normalized unicode characters on MacOSX.
* Support visual and audible bell on MacOSX/Cocoa.
* Support KAM(CSI2h, CSI2l), SRM (CSI12h, CSI12l), DECBKM(CSI?67h, CSI?67l),
  DA3(CSI=c), DECDSR(CSI?n), WYSTCURM(CSI33h, CSI33l) OSC 104 and OSC 105.
* Snapshot screen and backlog by MC(CSI i).
* Add "use_ot_layout" / --otl option which enables to show \ 
substituting glyphs
  in open type fonts with the use of libotf or harfbuzz.
  (To layout indic scripts, build mlterm with harfbuzz (not libotf), add an
  indic script font to ~/.mlterm/*font, and start mlterm with -otl option.
  See mlterm-3.6.2/doc/en/README.indic in detail.)
* Add "OpenType Layout" to "Encoding" tab of mlconfig.
* Add "ot_script" / --ost and "ot_features" / --oft options.
* Add "regard_uri_as_word" / --uriword option which enables to select \ 
URI by double click
  regardless of "word_separators" option.
* Change the default value of "type_engine" option from \ 
"xft" to "cairo".
* Add vte_terminal_{set|get}_word_char_exceptions() to libvte compatible library.
* Add "Select URI by double click" to "Others" tab of mlconfig.
* Bug fixes:
  Fix "child-exited" signal of libvte (0.38 or later) compatible library.
  Fix position of a mouse pointer when EV_ABS event is received on Linux/Framebuffer.