Remove pthreads patch, roll in new patches, disable unchecked bit readers.

chromium/patches/to_upstream/53_matroska_codec_config.patch

+diff -wurp -N orig/libavformat/matroskadec.c ffmpeg/libavformat/matroskadec.c
+--- orig/libavformat/matroskadec.c      2012-02-01 06:28:26.500764099 -0800
++++ ffmpeg/libavformat/matroskadec.c    2012-02-01 08:14:02.540453816 -0800
+@@ -1542,7 +1542,9 @@ static int matroska_read_header(AVFormat
+         } else if (codec_id == CODEC_ID_RA_144) {
+             track->audio.out_samplerate = 8000;
+             track->audio.channels = 1;
+-        } else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
++        }
++#if CONFIG_RA_288_DECODER || CONFIG_COOK_DECODER || CONFIG_ATRAC3_DECODER || CONFIG_SIPR_DECODER
++        else if (codec_id == CODEC_ID_RA_288 || codec_id == CODEC_ID_COOK ||
+                    codec_id == CODEC_ID_ATRAC3 || codec_id == CODEC_ID_SIPR) {
+             int flavor;
+             ffio_init_context(&b, track->codec_priv.data,track->codec_priv.size,
+@@ -1570,6 +1572,7 @@ static int matroska_read_header(AVFormat
+                 extradata_offset = 78;
+             }
+         }
++#endif
+         track->codec_priv.size -= extradata_offset;
+ 
+         if (codec_id == CODEC_ID_NONE)
+@@ -1887,6 +1890,7 @@ static int matroska_parse_block(Matroska
+ 
+     if (res == 0) {
+         for (n = 0; n < laces; n++) {
++#if CONFIG_RA_288_DECODER || CONFIG_COOK_DECODER || CONFIG_ATRAC3_DECODER || CONFIG_SIPR_DECODER
+             if ((st->codec->codec_id == CODEC_ID_RA_288 ||
+                  st->codec->codec_id == CODEC_ID_COOK ||
+                  st->codec->codec_id == CODEC_ID_SIPR ||
+@@ -1933,7 +1937,9 @@ static int matroska_parse_block(Matroska
+                     pkt->stream_index = st->index;
+                     dynarray_add(&matroska->packets,&matroska->num_packets,pkt);
+                 }
+-            } else {
++            } else
++#endif
++            {
+                 MatroskaTrackEncoding *encodings = track->encodings.elem;
+                 int offset = 0, pkt_size = lace_size[n];
+                 uint8_t *pkt_data = data;