gdm-simple-greeter's LANG value is foobar.utf8, not foobar.UTF-8

[Kazutoshi Morioka <morioka at wakwak com>]

F9's gdm-simple-greeter's language chooser set LANG value to foobar.utf8, not
foobar.UTF-8. This dosen't cause any problems for most applications but
confuses F9-Preview Live Installer.

https://bugzilla.redhat.com/show_bug.cgi?id=443408

This patch fixes LANG value, but I don't know this is correct fix.
Any Idea?

diff -u gdm-2.21.10/gui/simple-greeter/gdm-languages.c.old
gdm-2.21.10/gui/simple-greeter/gdm-languages.c
--- gdm-2.21.10/gui/simple-greeter/gdm-languages.c.old  2008-04-09
12:47:10.000000000 +0900
+++ gdm-2.21.10/gui/simple-greeter/gdm-languages.c  2008-04-22
03:29:38.976189467 +0900
@@ -330,7 +330,7 @@
         if (language_name_is_utf8 (language_name)) {
                 name = g_strdup (language_name);
         } else {
-                name = g_strdup_printf ("%s.utf8", language_name);
+                name = g_strdup_printf ("%s.UTF-8", language_name);

                 if (!language_name_is_utf8 (name)) {
                         g_free (name);