Emacs fails to use default locale

[Ken Brown]

According to

  http://www.opengroup.org/onlinepubs/007908799/xbd/envvar.html

if LC_ALL, LC_CTYPE, and LANG are all either unset or empty, then the 
implementation-dependent default locale is supposed to be used.  My 
understanding is that this should be done by using setlocale(LC_CTYPE, 
"").  But emacs's locale initialization seems to just use the 
environment variables, so it doesn't pick up the default locale if the 
variables are unset.

Ken