libvpx: Pull from upstream

source/libvpx/configure

Index: source/libvpx/configure
===================================================================
--- source/libvpx/configure	(revision 177019)
+++ source/libvpx/configure	(working copy)
@@ -106,6 +106,7 @@
 all_platforms="${all_platforms} ppc64-darwin9-gcc"
 all_platforms="${all_platforms} ppc64-linux-gcc"
 all_platforms="${all_platforms} sparc-solaris-gcc"
+all_platforms="${all_platforms} x86-android-gcc"
 all_platforms="${all_platforms} x86-darwin8-gcc"
 all_platforms="${all_platforms} x86-darwin8-icc"
 all_platforms="${all_platforms} x86-darwin9-gcc"
@@ -238,15 +239,17 @@
 "
 EXPERIMENT_LIST="
     csm
-    comp_intra_pred
-    superblocks
-    pred_filter
     lossless
-    subpelrefmv
     new_mvref
     implicit_segmentation
     newbintramodes
     comp_interintra_pred
+    tx64x64
+    dwtdcthybrid
+    cnvcontext
+    newcoefcontext
+    enable_6tap
+    abovesprefmv
 "
 CONFIG_LIST="
     external_build
@@ -660,6 +663,10 @@
         *-android-*)
             # GTestLog must be modified to use Android logging utilities.
         ;;
+        *-darwin-*)
+            # iOS/ARM builds do not work with gtest. This does not match
+            # x86 targets.
+        ;;
         *)
             check_cxx "$@" <<EOF && soft_enable unit_tests
 int z;