Add arm64-darwin-gcc target.

Change-Id: I251cca45db54d2947868e2b9c35cb54f86b10706

README

diff --git a/README b/README
index f209105..f9c24ff 100644
--- a/README
+++ b/README
@@ -55,6 +55,7 @@
     armv6-linux-rvct
     armv6-linux-gcc
     armv6-none-rvct
+    arm64-darwin-gcc
     armv7-android-gcc
     armv7-darwin-gcc
     armv7-linux-rvct

build/make/configure.sh

diff --git a/build/make/configure.sh b/build/make/configure.sh
index d4124c7..0fe8ead 100755
--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -799,7 +799,7 @@
     arm*)
         # on arm, isa versions are supersets
         case ${tgt_isa} in
-        armv8)
+        arm64|armv8)
             soft_enable neon
             ;;
         armv7|armv7s)

configure

diff --git a/configure b/configure
index 9a7de73..0dca4c3 100755
--- a/configure
+++ b/configure
@@ -96,6 +96,7 @@
 all_platforms="${all_platforms} armv6-linux-rvct"
 all_platforms="${all_platforms} armv6-linux-gcc"
 all_platforms="${all_platforms} armv6-none-rvct"
+all_platforms="${all_platforms} arm64-darwin-gcc"
 all_platforms="${all_platforms} armv7-android-gcc"   #neon Cortex-A8
 all_platforms="${all_platforms} armv7-darwin-gcc"    #neon Cortex-A8
 all_platforms="${all_platforms} armv7-linux-rvct"    #neon Cortex-A8