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

static_pthread_O2.patch

+diff -ur ffmpeg-mt.orig/configure ffmpeg-mt/configure
+--- ffmpeg-mt.orig/configure    2009-05-08 04:41:29.000000000 +0000
++++ ffmpeg-mt/configure 2009-08-07 21:16:34.000000000 +0000
+@@ -1216,7 +1216,7 @@
+ SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
+ LIB_INSTALL_EXTRA_CMD='$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
+ 
+-host_cflags='-O3 -g -Wall'
++host_cflags='-O2 -g -Wall'
+ host_libs='-lm'
+ 
+ target_path='.'
+@@ -2013,6 +2013,9 @@
+         add_extralibs -pthreads
+     elif check_func pthread_create -lpthreadGC2; then
+         add_extralibs -lpthreadGC2
++    elif check_func pthread_create -lpthreadGC2 -lws2_32; then
++        add_cflags -DPTW32_STATIC_LIB
++        add_extralibs -lpthreadGC2 -lws2_32
+     elif ! check_lib pthread.h pthread_create -lpthread; then
+         die "ERROR: can't find pthreads library"
+     fi
+@@ -2202,7 +2205,7 @@
+     elif enabled ccc; then
+         add_cflags -fast
+     else
+-        add_cflags -O3
++        add_cflags -O2
+     fi
+ fi
+ check_cflags -fno-math-errno
+diff -ur ffmpeg-mt.orig/libavcodec/allcodecs.c ffmpeg-mt/libavcodec/allcodecs.c
+--- ffmpeg-mt.orig/libavcodec/allcodecs.c       2009-05-07 21:41:29.000000000 -0700
++++ ffmpeg-mt/libavcodec/allcodecs.c    2009-08-07 10:51:13.226355400 -0700
+@@ -45,6 +45,14 @@
+           extern AVBitStreamFilter x##_bsf; \
+           if(CONFIG_##X##_BSF)     av_register_bitstream_filter(&x##_bsf); }
+ 
++#ifdef PTW32_STATIC_LIB
++static void detach_ptw32(void)
++{
++    pthread_win32_thread_detach_np();
++    pthread_win32_process_detach_np();
++}
++#endif
++
+ void avcodec_register_all(void)
+ {
+     static int initialized;
+@@ -53,6 +61,11 @@
+         return;
+     initialized = 1;
+ 
++#ifdef PTW32_STATIC_LIB
++    pthread_win32_process_attach_np();
++    pthread_win32_thread_attach_np();
++    atexit(detach_ptw32);
++#endif
+     /* hardware accelerators */
+     REGISTER_HWACCEL (H263_VAAPI, h263_vaapi);
+     REGISTER_HWACCEL (MPEG2_VAAPI, mpeg2_vaapi);