re-work to retain a copy of the cached charset rather than the actual

re-work to retain a copy of the cached charset rather than the actual

2003-11-07  Mark McLoughlin  <mark@skynet.ie>

        * glib/gconvert.c: (get_filename_charset): re-work to
        retain a copy of the cached charset rather than the
        actual return value from g_get_charset (which may
        change). Also, re-initialize the cache if it does
        change. See bug #126454.