Make X264_init() no longer assign avctx->rc_eq to libx264's context.

Fix a crash due to X264_init() setting the libx264 rc_eq field to NULL
when rc_eq was not defined. As a consequence rc_eq can no longer be
manually specified and passed to libx264, but this option is going to
be removed from the libx264 public API anyway.

See the thread: "Fix crash in libx264 when rc_eq is not set".

Originally committed as revision 15029 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libx264.c

@@ -253,7 +253,6 @@ X264_init(AVCodecContext *avctx)
     x4->params.rc.f_ip_factor = 1/fabs(avctx->i_quant_factor);
     x4->params.rc.f_pb_factor = avctx->b_quant_factor;
     x4->params.analyse.i_chroma_qp_offset = avctx->chromaoffset;
-    x4->params.rc.psz_rc_eq = avctx->rc_eq;
 
     x4->params.analyse.b_psnr = avctx->flags & CODEC_FLAG_PSNR;
     x4->params.i_log_level = X264_LOG_DEBUG;