bug#61960: 30.0.50; Unexec build reliably crashes during loadup

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: 61960@debbugs.gnu.org, Konstantin Kharlamov <hi-angel@yandex.ru>
> Date: Mon, 06 Mar 2023 17:12:55 +0000
> 
> > debugging session :) Yeah, if native compilation isn't supposed to work with
> > unexec(), it might be a good idea to disable that, sure.
> 
> Eli related to this, do you think is better to install the attached on
> 29 or master?

Don't we already have an equivalent test?

  if test "${with_native_compilation}" != "no"; then
      if test "${HAVE_PDUMPER}" = no; then
         AC_MSG_ERROR(['--with-native-compilation' requires 
'--with-dumping=pdumper'])
      fi