libvpx: Pull from upstream

source/libvpx/configure

Index: source/libvpx/configure
===================================================================
--- source/libvpx/configure	(revision 263011)
+++ source/libvpx/configure	(working copy)
@@ -51,6 +51,7 @@
   ${toggle_postproc_visualizer}   macro block / block level visualizers
   ${toggle_multi_res_encoding}    enable multiple-resolution encoding
   ${toggle_temporal_denoising}    enable temporal denoising and disable the spatial denoiser
+  ${toggle_webm_io}               enable input from and output to WebM container
 
 Codecs:
   Codecs can be selectively enabled or disabled individually, or by family:
@@ -160,6 +161,18 @@
     [ -f ${source_path}/${t}.mk ] && enable_feature ${t}
 done
 
+if ! perl --version >/dev/null; then
+    die "Perl is required to build"
+fi
+
+
+if [ "`cd ${source_path} && pwd`" != "`pwd`" ]; then
+  # test to see if source_path already configured
+  if [ -f ${source_path}/vpx_config.h ]; then
+    die "source directory already configured; run 'make distclean' there first"
+  fi
+fi
+
 # check installed doxygen version
 doxy_version=$(doxygen --version 2>/dev/null)
 doxy_major=${doxy_version%%.*}
@@ -252,7 +265,6 @@
 "
 EXPERIMENT_LIST="
     multiple_arf
-    non420
     alpha
 "
 CONFIG_LIST="
@@ -300,6 +312,7 @@
     postproc_visualizer
     os_support
     unit_tests
+    webm_io
     decode_perf_tests
     multi_res_encoding
     temporal_denoising
@@ -353,6 +366,7 @@
     small
     postproc_visualizer
     unit_tests
+    webm_io
     decode_perf_tests
     multi_res_encoding
     temporal_denoising
@@ -675,6 +689,7 @@
              10|11|12)
                  VCPROJ_SFX=vcxproj
                  gen_vcproj_cmd=${source_path}/build/make/gen_msvs_vcxproj.sh
+                 enabled werror && gen_vcproj_cmd="${gen_vcproj_cmd} --enable-werror"
                  ;;
              esac
              all_targets="${all_targets} solution"
@@ -689,6 +704,9 @@
         enabled postproc || die "postproc_visualizer requires postproc to be enabled"
     fi
 
+    # Enable WebM IO by default.
+    soft_enable webm_io
+
     # Enable unit tests by default if we have a working C++ compiler.
     case "$toolchain" in
         *-vs*)