libvpx: Pull from upstream

source/libvpx/CHANGELOG

+2013-11-15 v1.3.0 "Forest"
+  This release introduces the VP9 codec in a backward-compatible way.
+  All existing users of VP8 can continue to use the library without
+  modification. However, some VP8 options do not map to VP9 in the same manner.
+
+  The VP9 encoder in this release is not feature complete. Users interested in
+  the encoder are advised to use the git master branch and discuss issues on
+  libvpx mailing lists.
+
+  - Upgrading:
+    This release is ABI and API compatible with Duclair (v1.0.0). Users
+    of older releases should refer to the Upgrading notes in this document
+    for that release.
+
+  - Enhancements:
+      Get rid of bashisms in the main build scripts
+      Added usage info on command line options
+      Add lossless compression mode
+      Dll build of libvpx
+      Add additional Mac OS X targets: 10.7, 10.8 and 10.9 (darwin11-13)
+      Add option to disable documentation
+      configure: add --enable-external-build support
+      make: support V=1 as short form of verbose=yes
+      configure: support mingw-w64
+      configure: support hardfloat armv7 CHOSTS
+      configure: add support for android x86
+      Add estimated completion time to vpxenc
+      Don't exit on decode errors in vpxenc
+      vpxenc: support scaling prior to encoding
+      vpxdec: support scaling output
+      vpxenc: improve progress indicators with --skip
+      msvs: Don't link to winmm.lib
+      Add a new script for producing vcxproj files
+      Produce Visual Studio 10 and 11 project files
+      Produce Windows Phone project files
+      msvs-build: use msbuild for vs >= 2005
+      configure: default configure log to config.log
+      Add encoding option --static-thresh
+
+  - Speed:
+      Miscellaneous speed optimizations for VP8 and VP9.
+
+  - Quality:
+      In general, quality is consistent with the Eider release.
+
+  - Bug Fixes:
+      This release represents approximately a year of engineering effort,
+      and contains multiple bug fixes. Please refer to git history for details.
+
+
 2012-12-21 v1.2.0
   This release acts as a checkpoint for a large amount of internal refactoring
   and testing. It also contains a number of small bugfixes, so all users are
   encouraged to upgrade.
 
   - Upgrading:
     This release is ABI and API compatible with Duclair (v1.0.0). Users
     of older releases should refer to the Upgrading notes in this
     document for that release.
 
@@ skipping 514 matching lines @@
       * Detect toolchain to be used automatically for native builds
       * Support building shared libraries
       * Better autotools emulation (--prefix, --libdir, DESTDIR)
   - Updated LICENSE
       * http://webmproject.blogspot.com/2010/06/changes-to-webm-open-source-license.html
 
 
 2010-05-18 v0.9.0
   - Initial open source release. Welcome to WebM and VP8!