bug#24033: Porting emacs-25 to GNU/Linux ppc64 with draft glibc 2.24

[Paul Eggert]

Tags: patch

I'd like to backport the attached patch from master to emacs-25. The 
idea is that Emacs 25 should work with glibc 2.24 (which is still in 
draft form). glibc is withdrawing support for some deprecated symbols 
like malloc_set_state and __malloc_initialize_hook. Emacs is intended to 
be portable to systems lacking these symbols, but this apparently does 
not work on ppc64 and ppc64le platforms. As noted in 
<https://sourceware.org/ml/libc-alpha/2016-07/msg00546.html>, the 
attached patch has been tested on emacs-25 and works on the affected 
platforms. I've also tested it on unaffected platforms such as x86 and 
x86-64.

This issue may be a release blocker for glibc 2.24 (this still hasn't 
been decided). I'd rather that Emacs didn't get in the way of the malloc 
performance improvements intended for glibc 2.24, and installing this 
patch into emacs-25 should help with that.

0001-Port-to-glibc-2.24-pre-release-ppc64.patch
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