Eliminate dead code with !ENABLE_SOUT (fixes #4564)

src/input/decoder.c

@@ -1611,6 +1611,7 @@ static void DecoderPlaySpu( decoder_t *p_dec, subpicture_t *p_subpic,
     }
 }
 
+#ifdef ENABLE_SOUT
 static void DecoderPlaySout( decoder_t *p_dec, block_t *p_sout_block,
                              bool b_telx )
 {
@@ -1681,6 +1682,7 @@ static void DecoderPlaySout( decoder_t *p_dec, block_t *p_sout_block,
         }
     }
 }
+#endif
 
 /* */
 static void DecoderFlushBuffering( decoder_t *p_dec )
@@ -1738,6 +1740,7 @@ static void DecoderFlushBuffering( decoder_t *p_dec )
     }
 }
 
+#ifdef ENABLE_SOUT
 /* This function process a block for sout
  */
 static void DecoderProcessSout( decoder_t *p_dec, block_t *p_block )
@@ -1794,6 +1797,7 @@ static void DecoderProcessSout( decoder_t *p_dec, block_t *p_block )
         }
     }
 }
+#endif
 
 /* This function process a video block
  */