bug#36649: 27.0.50; pure space and pdumper

[Eli Zaretskii]

> Cc: larsi@gnus.org, rpluim@gmail.com, stefan@marxist.se,
>  schwab@linux-m68k.org, monnier@iro.umontreal.ca, 36649@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Wed, 19 May 2021 10:43:24 -0700
> 
> On 5/19/21 10:38 AM, Eli Zaretskii wrote:
> > The problem is not in gmalloc.c, the problem is in every src/*.c file
> > that calls 'free'.  That's because we redirect to hybrid_free in
> > conf_post.h, but Gnulib's stdlib.h is included after that,
> 
> Have conf_post.h include stdlib.h before it redefines 'free'. It should 
> do that anyway, since POSIX stdlib.h is allowed to define 'free' as a macro.

Thanks, this does work and looks much cleaner, so I've now made that
change.