[RFA/libiberty] use TOLOWER instead of tolower in filename_cmp.c

[Joel Brobecker]

> > 2007-05-03  Joel Brobecker  <brobecker@adacore.com>
> > 
> > 	* filename_cmp.c: Replace include of ctype.h by include of
> > 	safe-ctype.h.
> > 	(filename_cmp): Use TOLOWER instead of tolower for conversions
> > 	that are locale-independent.
> > 	* Makefile.in (filename_cmp.o): Add dependency on safe-ctype.h.
> 
> This is OK.  Thanks.

Thanks for the quick review! I just checked this in.

-- 
Joel