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dither: remove -t/-r options and scale parameter

Remove unused -t and -r options to dither, as well as the dither scale
parameter. The related functionality had already been removed in
version 14.3.0.

--- a/src/dither.c

+++ b/src/dither.c

@@ -335,12 +335,11 @@

   priv_t * p = (priv_t *)effp->priv;

   int c;

   lsx_getopt_t optstate;

-  lsx_getopt_init(argc, argv, "+aSsf:p:rt", NULL, lsx_getopt_flag_none, 1, &optstate);

+  lsx_getopt_init(argc, argv, "+aSsf:p:", NULL, lsx_getopt_flag_none, 1, &optstate);

   while ((c = lsx_getopt(&optstate)) != -1) switch (c) {

     case 'a': p->auto_detect = sox_true; break;

     case 'S': p->alt_tpdf = sox_true; break;

-    case 'r': case 't': break; /* No longer in use */

     case 's': p->filter_name = Shape_shibata; break;

     case 'f':

       p->filter_name = lsx_enum_option(c, optstate.arg, filter_names);

@@ -351,7 +350,6 @@

     default: lsx_fail("invalid option `-%c'", optstate.opt); return lsx_usage(effp);

   }

   argc -= optstate.ind, argv += optstate.ind;

-  do {NUMERIC_PARAMETER(dummy, 0.5, 1)} while (0); /* No longer in use */

   return argc? lsx_usage(effp) : SOX_SUCCESS;

 }