bug#12242: Emacs 24.2 RC1 build fails on OpenBSD

[Eli Zaretskii <eliz@gnu.org>]

> From: jca@wxcvbn.org (Jérémie Courrèges-Anglas)
> Date: Mon, 20 Aug 2012 21:53:16 +0200
> 
> Checking /home/jca/src/emacs-24.2/leim/quail/cyril-jis.el ...
> Fatal error (11)Segmentation fault (core dumped) 
> gmake[1]: *** [leim-list.el] Error 139
> gmake[1]: Leaving directory `/home/jca/src/emacs-24.2/leim'
> gmake: *** [leim] Error 2
> $ 
> [...]
> #0  free_bloc (bloc=0x1b8fa80) at ralloc.c:719
> 719       if (heap->first_bloc == bloc)
> (gdb) bt
> #0  free_bloc (bloc=0x1b8fa80) at ralloc.c:719
> [...]
> Using git bisect, I was able to track the build error up to the
> 573c8f870aa68b8c5937524e1a4db645026a3240 git commit id:
> 
>      Backport: Really fix bug #11519, by fixing the last change in ralloc.c.
> 
>       src/ralloc.c (r_alloc_inhibit_buffer_relocation): Fix stupid
>       thinko
>       in the logic of incrementing and decrementing the value of
>       use_relocatable_buffers.
> 
> Sorry for not providing the hg commit id.
> Reverting that commit actually makes rc1 build again, but I have not
> tried to find a proper fix.

I think I see the problem and will fix it later today.