tests/test-gendoc-zh_TW.t

rust-chg: extract signal handlers from chg/procutil.c

abortmsgerrno() and debugmsg() are removed, and the public interface instead
returns success/error status. Since signal handlers can't propagate errors,
the result of kill() is just ignored.

#require docutils gettext

  $ $TESTDIR/check-gendoc zh_TW
  checking for parse errors