bug#12566: ls case-insensitivie

[Michael Talbot-Wilson]

$ ls -lFGgd [G-G]*
drwxr-xr-x 4 4096 Apr  8 13:13 GC/
$ ls -lFGgd [F-G]*
drwxr-xr-x  4 4096 Apr  8 13:13 GC/
drwxr-xr-x 16 4096 Jun 11 15:43 gtk+-2.24.4/
$ ls --version
ls (GNU coreutils) 8.9
Copyright (C) 2011 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
$ cat /proc/version
Linux version 2.6.29.6-smp (address@hidden) (gcc version 4.3.3 (GCC) ) #2
SMP Mon Aug 17 00:52:54 CDT 2009