Subject: bug#19000: portability is hard: don't assume zh_CN.UTF-8 is installed

From: Jim Meyering <[email-masked]>
Date: Sun, 9 Nov 2014 10:34:52 -0800

While testing, I happened to use a system for which that locale was
not installed, and that made the word-multibyte test fail.

Here's the patch I'm about to push: