build: Drop stray mpc8 decoder dependency on dsputil

configure

@@ -1746,7 +1746,7 @@ mp3float_decoder_select="mpegaudio"
 mp3on4_decoder_select="mpegaudio"
 mp3on4float_decoder_select="mpegaudio"
 mpc7_decoder_select="dsputil mpegaudiodsp"
-mpc8_decoder_select="dsputil mpegaudiodsp"
+mpc8_decoder_select="mpegaudiodsp"
 mpeg_xvmc_decoder_deps="X11_extensions_XvMClib_h"
 mpeg_xvmc_decoder_select="mpeg2video_decoder"
 mpeg1video_decoder_select="error_resilience mpegvideo"

libavcodec/mpc8.c

@@ -29,7 +29,6 @@
 #include "libavutil/lfg.h"
 #include "avcodec.h"
 #include "get_bits.h"
-#include "dsputil.h"
 #include "internal.h"
 #include "mpegaudiodsp.h"
 
@@ -119,7 +118,6 @@ static av_cold int mpc8_decode_init(AVCodecContext * avctx)
     }
     memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
     av_lfg_init(&c->rnd, 0xDEADBEEF);
-    ff_dsputil_init(&c->dsp, avctx);
     ff_mpadsp_init(&c->mpadsp);
 
     ff_mpc_init();