Log Message:
Update to rxvt-unicode-8.3, provided by Philip Paeps <philip@freebsd.org>.

ChangeLog:
o new option: skipScroll/-ss, enabled by default.
o go with the times and expect x11 library files in /usr/lib, not
  /usr/X11R6/lib.
o initial transparency improvement/afterimage support patch by Sasha Vasko.
o add urgentOnBell resource to set the urgency hint (patch by Philip Paeps).
o do not process focus events caused by grabs (patch by Mikachu).
o add iso14755_52 resource to disable iso14755 5.2 (exg).
o add binding for backspace in iso14755 5.1 to remove the last digit (exg).
o better option handling, support more than 30 options (exg).
o nuke reconf script, serves no purpose anymore.
o fixed and documented matcher/on_user_command processing in matcher extension
  (tpope).
o compile out of the box on Solaris 10 (exg).
o fix MappingNotify events (reported by Stephan Walter).
o zero-initialise mwmhints, this seems to solve all sorts of minor problems.