The "process-kill-without-query" function was made obsolete in emacs 27.1 [1].
Therefore the function should be replaced in japanese/yc.el by "set-process-query-on-exit-flag" function.
[1] http://git.savannah.gnu.org/cgit/emacs.git/commit/?id=f1c48b0
Submitted by Takayuki Nakao <t@nakao.org> (maintainer) in PR 249873.
Tested on Poudriere (amd64, i386). 'portlint -AC' seems happy.