libvpx: Pull from upstream

source/config/linux/arm64/vpx_config.c

Index: source/config/linux/arm64/vpx_config.c
===================================================================
--- source/config/linux/arm64/vpx_config.c	(revision 0)
+++ source/config/linux/arm64/vpx_config.c	(revision 0)
@@ -0,0 +1,9 @@
+/* Copyright (c) 2011 The WebM project authors. All Rights Reserved. */
+/*  */
+/* Use of this source code is governed by a BSD-style license */
+/* that can be found in the LICENSE file in the root of the source */
+/* tree. An additional intellectual property rights grant can be found */
+/* in the file PATENTS.  All contributing project authors may */
+/* be found in the AUTHORS file in the root of the source tree. */
+static const char* const cfg = "--force-target=armv8-linux-gcc --enable-pic --enable-realtime-only --enable-external-build --enable-postproc --disable-install-srcs --enable-multi-res-encoding --enable-temporal-denoising --disable-unit-tests --disable-install-docs --disable-examples --disable-avx2";
+const char *vpx_codec_build_config(void) {return cfg;}