Remove aout-rate

I assume this breaks with S/PDIF. And I do not see much use for this.

src/audio_output/output.c

@@ -53,10 +53,6 @@ int aout_OutputNew( audio_output_t *p_aout,
     aout_assert_locked( p_aout );
     p_aout->format = *p_format;
 
-    /* Retrieve user defaults. */
-    int i_rate = var_InheritInteger( p_aout, "aout-rate" );
-    if ( i_rate != 0 )
-        p_aout->format.i_rate = i_rate;
     aout_FormatPrepare( &p_aout->format );
 
     /* Find the best output plug-in. */

src/libvlc-module.c

@@ -1640,8 +1640,7 @@ vlc_module_begin ()
     add_integer_with_range( "volume-step", AOUT_VOLUME_STEP, 0,
                             AOUT_VOLUME_MAX, VOLUME_STEP_TEXT,
                             VOLUME_STEP_LONGTEXT, true )
-    add_integer( "aout-rate", 0, AOUT_RATE_TEXT,
-                 AOUT_RATE_LONGTEXT, true )
+    add_obsolete_integer( "aout-rate" ) /* since 1.2.0 */
 #if HAVE_FPU && !defined( __APPLE__ )
     add_bool( "hq-resampling", 1, AOUT_RESAMP_TEXT,
               AOUT_RESAMP_LONGTEXT, true )