bug#68213: 30.0.50; completion-preview-tests failure in --without-x build

[Eli Zaretskii]

> Date: Tue, 02 Jan 2024 10:42:59 -0600
> From:  john muhl via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Running ‘make -k -C test check-lisp’ on master with a build
> configured without X produces the following error:
> 
>   cd emacs
>   ./autogen.sh
>   ./configure --without-x
>   make -j$(nproc)
>   make -k -C test check-lisp
>   …
>   In toplevel form:
>   lisp/completion-preview-tests.el:23:2: Error: Symbol's value
>   as variable is void: mouse-wheel-up-event
>   make[3]: *** [Makefile:159: lisp/completion-preview-tests.elc] Error 1
>   make[3]: Target 'lisp/completion-preview-tests.log' not remade because of 
> errors.

Thanks, please try again, I hope I fixed this.