This update for rxvt-unicode fixes the following issues:

- Update to version 9.31: (CVE-2022-4170 boo#1206069)

  - implement a fix for CVE-2022-4170 (reported and analyzed by
    David Leadbeater). While present in version 9.30, it should not
    be exploitable. It is exploitable in versions 9.25 and 9.26, at
    least, and allows anybody controlling output to the terminal to
    execute arbitrary code in the urxvt process.
  - the background extension no longer requires off focus fading
    support to be compiled in.
  - the confirm-paste extension now offers a choice betwene pasting
    the original or a sanitized version, and also frees up memory
    used to store the paste text immediately.
  - fix compiling without frills.
  - fix rewrapMode: never.
  - fix regression that caused urxvt to no longer emit responses to
    OSC color queries other than OSC 4 ones.
  - fix regression that caused urxvt to no longer process OSC 705.
  - restore CENTURY to be 1900 to "improve" year parsing in urclock
    (or at least go back to the old interpretation) (based on an
    analysis by Tommy Pettersson).
  - exec_async (used e.g. by the matcher extension to spawn
    processes) now sets the URXVT_EXT_WINDOWID variable to the
    window id of the terminal.
  - implement -fps option/refreshRate resource to change the
    default 60 Hz maximum refresh limiter. I always wanted an fps
    option, but had to wait for a user requesting it.
  - new clickthrough extension.
  - perl now also requires Xext.
  - X region and shape extension functionality has been exposed to
    perl extensions.
  - RENDER extension no longer depends on ENABLE_XIM_ONTHESPOT.