Should Emacs 26 be portable to Glibc 2.28?

[Paul Eggert]

The attached patch, which I've installed into Emacs master, fixes a 
incompatibility between Emacs and the planned 2.28 release of glibc. 
Should I install it into the emacs-26 branch? glibc 2.28 is currently 
scheduled for August, so this shouldn't be much of an issue until then; 
however, as the patch is reasonably conservative and it's likely there 
won't be another Emacs release before August, it might make sense to 
install this patch into the emacs-26 branch now.

The underlying problem is that Emacs (via gnulib) mucks with glibc 
internals that are planned to change in glibc 2.28. For more see the 
thread here:

https://lists.gnu.org/r/bug-gnulib/2018-03/msg00000.html

t.patch
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