Remove libvpx from FFmpeg in favour of ffvp8.

ffmpeg/source/config/ChromiumOS/linux/x64/config.h

Index: ffmpeg/source/config/ChromiumOS/linux/x64/config.h
diff --git a/ffmpeg/source/config/ChromiumOS/linux/x64/config.h b/ffmpeg/source/config/ChromiumOS/linux/x64/config.h
index f98df202d02daa9c6a187721dbd3e08fa354a2d1..1707ce7fa5ed8f76221e26317c4eca796b5fe99c 100644
--- a/ffmpeg/source/config/ChromiumOS/linux/x64/config.h
+++ b/ffmpeg/source/config/ChromiumOS/linux/x64/config.h
@@ -1,7 +1,7 @@
 /* Automatically generated by configure - do not modify! */
 #ifndef FFMPEG_CONFIG_H
 #define FFMPEG_CONFIG_H
-#define FFMPEG_CONFIGURATION "--disable-everything --enable-fft --enable-rdft --disable-network --disable-bzlib --disable-zlib --disable-swscale --disable-amd3dnow --disable-amd3dnowext --enable-shared --enable-libvpx --enable-decoder='theora,vorbis,libvpx' --enable-encoder=libvpx --enable-decoder='pcm_u8,pcm_s16le,pcm_f32le' --enable-demuxer='ogg,matroska,wav' --extra-cflags=-I../../../libvpx/include --extra-ldflags=-L../../../libvpx/lib/linux/x64 --enable-decoder=vp8 --enable-parser=vp8 --enable-demuxer=flac --enable-decoder=flac"
+#define FFMPEG_CONFIGURATION "--disable-everything --enable-fft --enable-rdft --disable-network --disable-bzlib --disable-zlib --disable-swscale --disable-amd3dnow --disable-amd3dnowext --enable-shared --enable-decoder='theora,vorbis,vp8' --enable-decoder='pcm_u8,pcm_s16le,pcm_f32le' --enable-demuxer='ogg,matroska,wav' --enable-parser=vp8 --enable-demuxer=flac --enable-decoder=flac"
 #define FFMPEG_LICENSE "LGPL version 2.1 or later"
 #define FFMPEG_DATADIR "/usr/local/share/ffmpeg"
 #define CC_TYPE "gcc"
@@ -150,7 +150,7 @@
 #define CONFIG_BSFS 0
 #define CONFIG_DECODERS 1
 #define CONFIG_DEMUXERS 1
-#define CONFIG_ENCODERS 1
+#define CONFIG_ENCODERS 0
 #define CONFIG_FILTERS 0
 #define CONFIG_HWACCELS 0
 #define CONFIG_INDEVS 0
@@ -204,7 +204,7 @@
 #define CONFIG_LIBVO_AACENC 0
 #define CONFIG_LIBVO_AMRWBENC 0
 #define CONFIG_LIBVORBIS 0
-#define CONFIG_LIBVPX 1
+#define CONFIG_LIBVPX 0
 #define CONFIG_LIBX264 0
 #define CONFIG_LIBXAVS 0
 #define CONFIG_LIBXVID 0
@@ -529,7 +529,7 @@
 #define CONFIG_LIBOPENJPEG_DECODER 0
 #define CONFIG_LIBSCHROEDINGER_DECODER 0
 #define CONFIG_LIBSPEEX_DECODER 0
-#define CONFIG_LIBVPX_DECODER 1
+#define CONFIG_LIBVPX_DECODER 0
 #define CONFIG_A64MULTI_ENCODER 0
 #define CONFIG_A64MULTI5_ENCODER 0
 #define CONFIG_ASV1_ENCODER 0
@@ -642,7 +642,7 @@
 #define CONFIG_LIBVO_AACENC_ENCODER 0
 #define CONFIG_LIBVO_AMRWBENC_ENCODER 0
 #define CONFIG_LIBVORBIS_ENCODER 0
-#define CONFIG_LIBVPX_ENCODER 1
+#define CONFIG_LIBVPX_ENCODER 0
 #define CONFIG_LIBX264_ENCODER 0
 #define CONFIG_LIBXAVS_ENCODER 0
 #define CONFIG_LIBXVID_ENCODER 0