FYI: use proper_name and proper_name_utf8

[Jim Meyering]

I've pushed a few change sets to make coreutils use gnulib's propername
module (the proper_name and proper_name_utf8).

  http://git.savannah.gnu.org/gitweb/?p=coreutils.git;a=summary

This change affects every single program.  Initially, I used both
functions, but noticed a significant code size increase, so ended up
making proper_name a no-op to save space.  Here's the comment I added
in system.h:

+#include "propername.h"
+/* Define away proper_name (leaving proper_name_utf8, which affects far
+   fewer programs), since it's not worth the cost of adding ~17KB to
+   the x86_64 text size of every single program.  This avoids a 40%
+   (almost ~2MB) increase in the on-disk space utilization for the set
+   of the 100 binaries. */
+#define proper_name(x) (x)

Here's a detail I would have missed had I not built
on solaris and noticed the link failure there:

  Users of the propername function must link with $(LIBICONV).