ENABLE_NLS not means libintl.h, v2.0.21

In some places this code used:

#if ENABLE_NLS
#include <libintl.h>
...

But in other places, like in sort, ENABLE_NLS used to activate collating & 
other POSIX locale stuff not related to libintl at all.

Please always use
if (HAVE_LIBINTL_H && ENABLE_NLS)
#include <libintl.h>
...
instead.

-- 
Andrey A. Chernov
http://ache.pp.ru/