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

r19350_init_loop_filter_127fix.patch

+commit 65b567e7b7a1f2687baee2e4e53bf537013d2477
+Author: reimar <reimar@9553f0bf-9b14-0410-a0b8-cfaf0461ba5b>
+Date:   Sun Jul 5 18:25:58 2009 +0000
+
+    Extend init_loop_filter to work for filter limit values up to 127 instead
+    of only up to 64. 127 is the maximum value allowed by the theora specification.
+    
+    
+    git-svn-id: file:///var/local/repositories/ffmpeg/trunk@19350 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b
+
+diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
+index 7612851..66ac2f9 100644
+--- a/libavcodec/vp3.c
++++ b/libavcodec/vp3.c
+@@ -517,23 +517,30 @@ static void init_dequantizer(Vp3DecodeContext *s, int qpi)
+ /*
+  * This function initializes the loop filter boundary limits if the frame's
+  * quality index is different from the previous frame's.
++ *
++ * The filter_limit_values may not be larger than 127.
+  */
+ static void init_loop_filter(Vp3DecodeContext *s)
+ {
+     int *bounding_values= s->bounding_values_array+127;
+     int filter_limit;
+     int x;
++    int value;
+ 
+     filter_limit = s->filter_limit_values[s->qps[0]];
+ 
+     /* set up the bounding values */
+     memset(s->bounding_values_array, 0, 256 * sizeof(int));
+     for (x = 0; x < filter_limit; x++) {
+-        bounding_values[-x - filter_limit] = -filter_limit + x;
+         bounding_values[-x] = -x;
+         bounding_values[x] = x;
+-        bounding_values[x + filter_limit] = filter_limit - x;
+     }
++    for (x = value = filter_limit; x < 128 && value; x++, value--) {
++        bounding_values[ x] =  value;
++        bounding_values[-x] = -value;
++    }
++    if (value)
++        bounding_values[128] = value;
+     bounding_values[129] = bounding_values[130] = filter_limit * 0x02020202;
+ }
+