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.