avcodec: change version-check to 52.69.1 for libvpx encoding settings

(cherry picked from commit ae3528d4)
Signed-off-by: Ilkka Ollakka <ileoo@iki.fi>

modules/codec/avcodec/encoder.c

@@ -579,7 +579,7 @@ int OpenEncoder( vlc_object_t *p_this )
     /* Misc parameters */
     p_context->bit_rate = p_enc->fmt_out.i_bitrate;
 
-#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 52, 68, 2 )
+#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT( 52, 69, 2 )
     /* Set reasonable defaults to VP8, based on
        libvpx-720p preset from libvpx ffmpeg-patch */
     if( i_codec_id == CODEC_ID_VP8 )