Remove bitrate tolerance from libx264 interface

Nobody ever uses it correctly, and ffmpeg sets it incorrectly, so we'll just
leave it out.

Originally committed as revision 25720 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libx264.c

@@ -273,9 +273,6 @@ static av_cold int X264_init(AVCodecContext *avctx)
     if (avctx->level > 0)
         x4->params.i_level_idc = avctx->level;
 
-    x4->params.rc.f_rate_tolerance =
-        (float)avctx->bit_rate_tolerance/avctx->bit_rate;
-
     if ((avctx->rc_buffer_size != 0) &&
         (avctx->rc_initial_buffer_occupancy <= avctx->rc_buffer_size)) {
         x4->params.rc.f_vbv_buffer_init =