iosbuild.sh Add arm64 support to VPX.framework.

Change-Id: I30b1813b744c11c0ca4e84554539cc524e7ee034

build/make/iosbuild.sh

diff --git a/build/make/iosbuild.sh b/build/make/iosbuild.sh
index 9d9c374..35ae891 100755
--- a/build/make/iosbuild.sh
+++ b/build/make/iosbuild.sh
@@ -25,7 +25,8 @@
 LIBVPX_SOURCE_DIR=$(dirname "$0" | sed -e s,/build/make,,)
 LIPO=$(xcrun -sdk iphoneos${SDK} -find lipo)
 ORIG_PWD="$(pwd)"
-TARGETS="armv6-darwin-gcc
+TARGETS="arm64-darwin-gcc
+         armv6-darwin-gcc
          armv7-darwin-gcc
          armv7s-darwin-gcc
          x86-iphonesimulator-gcc
@@ -54,6 +55,9 @@
 target_to_preproc_symbol() {
   target="$1"
   case "${target}" in
+    arm64-*)
+      echo "__aarch64__"
+      ;;
     armv6-*)
       echo "__ARM_ARCH_6__"
       ;;