doc: mention prior stat change

For a file of size 1234 bytes, commit ca9aa759 had the side effect
of changing 'stat -c "%'s" file' from outputting "?s" to the nicer
"1,234", depending on locale.  This is worth mentioning in the NEWS.

Resolves part of http://bugs.gnu.org/14556.

* NEWS: Mention 8.7 improvement in stat.
* cfg.mk (old_NEWS_hash): Adjust accordingly.

NEWS

@@ -883,6 +883,9 @@ GNU coreutils NEWS                                    -*- outline -*-
   However, with the above change to %X, %Y and %Z, we've made %W work
   the same way as the others.
 
+  stat gained support for several printf-style flags, such as %'s for
+  listing sizes with the current locale's thousands separator.
+
 
 * Noteworthy changes in release 8.6 (2010-10-15) [stable]
 

cfg.mk

@@ -45,7 +45,7 @@ export VERBOSE = yes
 # 4914152 9e
 export XZ_OPT = -8e
 
-old_NEWS_hash = 2f50e9d959cf22ba3449426e68d9d2c3
+old_NEWS_hash = 6ae04dc3907ea1290f12e6b1507cc42c
 
 # Add an exemption for sc_makefile_at_at_check.
 _makefile_at_at_check_exceptions = ' && !/^cu_install_program =/'