get_filename_charset() needs to return false for filenames not encoded in

get_filename_charset() needs to return false for filenames not encoded in

2003-12-13  Hans Breuer  <hans@breuer.org>

	* glib/gconvert.c : get_filename_charset() needs to
	return false for filenames not encoded in utf-8,
	which is always true on win32

	* glibconfig.h.win32.in : (u)int64 modifier isn't the
	gcc 'll' but always the msvcrt one 'I64'

	* glib/glib.def : updated