bug#50058: 28.0.5; emacs build fails with undefined reference to malloc_info

[Eli Zaretskii]

> From: birdsite@airmail.cc
> Cc: Flappy Bird <birdsite@airmail.cc>,  50058@debbugs.gnu.org,  Eli
>  Zaretskii <eliz@gnu.org>
> Date: Sun, 15 Aug 2021 18:28:30 +0545
> 
> git pull origin
> git checkout testing
> git reset --hard HEAD
> git pull         # pulls from local master
> make 2&> ../make-emacs-aug-15-head
> 
> This one fails with some segmentation fault.
> 
> 
> Loading subr (compiled; note, source file is newer)...
> Loading subr (compiled; note, source file is newer)...
> Fatal error 11: Segmentation fault
> Segmentation fault

Run the failing command under GDB and show the backtrace from the
segfault.

(To see which command fails, say "make V=1".)