Disable SVQ3 checks if SVQ3 support is not compiled in.

Originally committed as revision 16462 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -2414,7 +2414,8 @@ static av_always_inline void hl_decode_mb_internal(H264Context *h, int simple){
     int i;
     int *block_offset = &h->block_offset[0];
     const int transform_bypass = !simple && (s->qscale == 0 && h->sps.transform_bypass);
-    const int is_h264 = simple || s->codec_id == CODEC_ID_H264;
+    /* is_h264 should always be true if SVQ3 is disabled. */
+    const int is_h264 = !ENABLE_SVQ3_DECODER || simple || s->codec_id == CODEC_ID_H264;
     void (*idct_add)(uint8_t *dst, DCTELEM *block, int stride);
     void (*idct_dc_add)(uint8_t *dst, DCTELEM *block, int stride);