bring back h264 build

Originally committed as revision 9555 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -5714,6 +5714,7 @@ static int decode_cabac_residual( H264Context *h, DCTELEM *block, int cat, int n
 
     int index[64];
 
+    int av_unused last;
     int coeff_count = 0;
 
     int abslevel1 = 1;