bug#21982: 25.1.50; Building emacs-25 branch fails

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Date: Sun, 22 Nov 2015 18:58:30 +0100
> 
> Directories for loaddefs: . ./calc ./calendar ./cedet ./cedet/ede 
> ./cedet/semantic ./cedet/semantic/analyze ./cedet/semantic/bovine 
> ./cedet/semantic/decorate ./cedet/semantic/symref ./cedet/semantic/wisent 
> ./cedet/srecode ./emacs-lisp ./emacs-parallel ./emulation ./erc ./eshell 
> ./gnus ./international ./language ./leim ./leim/ja-dic ./leim/quail ./mail 
> ./mh-e ./net ./nxml ./org ./play ./progmodes ./textmodes ./url ./vc
>   GEN      loaddefs.el
> Making generated-autoload-file local to  *autoload-file* while let-bound!
> *** Error in `../src/bootstrap-emacs': realloc(): invalid next size: 
> 0x00000000046edaf0 ***
> Fatal error 6: Aborted

Could be the same issue discussed here:

  http://lists.gnu.org/archive/html/emacs-devel/2015-11/msg01610.html

Does the previous loaddefs.el, the one that was NOT replaced due to
this, have any strange text in it, like null bytes?