10l, non-x86 fix

Originally committed as revision 3254 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h263dec.c

@@ -624,10 +624,13 @@ retry:
 }
 #endif
 
+#ifdef HAVE_MMX
     if(s->codec_id == CODEC_ID_MPEG4 && s->xvid_build && avctx->idct_algo == FF_IDCT_AUTO && (mm_flags & MM_MMX) && !(s->flags&CODEC_FLAG_BITEXACT)){
         avctx->idct_algo= FF_IDCT_LIBMPEG2MMX;
         avctx->width= 0; // force reinit
     }
+#endif
+
         /* After H263 & mpeg4 header decode we have the height, width,*/
         /* and other parameters. So then we could init the picture   */
         /* FIXME: By the way H263 decoder is evolving it should have */