Add patches for block-level quant in theora, -O2 on build, and statically link pthread on Windows

r19355_invalid_huffman_table.patch

+commit baa697105bd3e754076573ada39d3382c8f6968a
+Author: reimar <reimar@9553f0bf-9b14-0410-a0b8-cfaf0461ba5b>
+Date:   Mon Jul 6 09:22:39 2009 +0000
+
+    Make decode_init fail if the huffman tables are invalid and thus init_vlc fails.
+    Otherwise this will crash during decoding because the vlc tables are NULL.
+    Partially fixes ogv/smclock.ogv.1.101.ogv from issue 1240.
+    
+    
+    git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19355 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
+
+diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
+index ad32cc9..3f45428 100644
+--- a/libavcodec/vp3.c
++++ b/libavcodec/vp3.c
+@@ -1788,29 +1788,34 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
+         for (i = 0; i < 16; i++) {
+ 
+             /* DC histograms */
+-            init_vlc(&s->dc_vlc[i], 5, 32,
++            if (init_vlc(&s->dc_vlc[i], 5, 32,
+                 &s->huffman_table[i][0][1], 4, 2,
+-                &s->huffman_table[i][0][0], 4, 2, 0);
++                &s->huffman_table[i][0][0], 4, 2, 0) < 0)
++                goto vlc_fail;
+ 
+             /* group 1 AC histograms */
+-            init_vlc(&s->ac_vlc_1[i], 5, 32,
++            if (init_vlc(&s->ac_vlc_1[i], 5, 32,
+                 &s->huffman_table[i+16][0][1], 4, 2,
+-                &s->huffman_table[i+16][0][0], 4, 2, 0);
++                &s->huffman_table[i+16][0][0], 4, 2, 0) < 0)
++                goto vlc_fail;
+ 
+             /* group 2 AC histograms */
+-            init_vlc(&s->ac_vlc_2[i], 5, 32,
++            if (init_vlc(&s->ac_vlc_2[i], 5, 32,
+                 &s->huffman_table[i+16*2][0][1], 4, 2,
+-                &s->huffman_table[i+16*2][0][0], 4, 2, 0);
++                &s->huffman_table[i+16*2][0][0], 4, 2, 0) < 0)
++                goto vlc_fail;
+ 
+             /* group 3 AC histograms */
+-            init_vlc(&s->ac_vlc_3[i], 5, 32,
++            if (init_vlc(&s->ac_vlc_3[i], 5, 32,
+                 &s->huffman_table[i+16*3][0][1], 4, 2,
+-                &s->huffman_table[i+16*3][0][0], 4, 2, 0);
++                &s->huffman_table[i+16*3][0][0], 4, 2, 0) < 0)
++                goto vlc_fail;
+ 
+             /* group 4 AC histograms */
+-            init_vlc(&s->ac_vlc_4[i], 5, 32,
++            if (init_vlc(&s->ac_vlc_4[i], 5, 32,
+                 &s->huffman_table[i+16*4][0][1], 4, 2,
+-                &s->huffman_table[i+16*4][0][0], 4, 2, 0);
++                &s->huffman_table[i+16*4][0][0], 4, 2, 0) < 0)
++                goto vlc_fail;
+         }
+     }
+ 
+@@ -1844,6 +1849,10 @@ static av_cold int vp3_decode_init(AVCodecContext *avctx)
+     }
+ 
+     return 0;
++
++vlc_fail:
++    av_log(avctx, AV_LOG_FATAL, "Invalid huffman table\n");
++    return -1;
+ }
+ 
+ /*