A64: Add Android_a64 build target

Makefile.android

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 # Those definitions should be consistent with the main Makefile
-ANDROID_ARCHES = android_ia32 android_arm android_mipsel
+ANDROID_ARCHES = android_ia32 android_arm android_a64 android_mipsel
 MODES = release debug
 
 # Generates all combinations of ANDROID ARCHES and MODES,
 # e.g. "android_ia32.release" or "android_arm.release"
 ANDROID_BUILDS = $(foreach mode,$(MODES), \
                    $(addsuffix .$(mode),$(ANDROID_ARCHES)))
 
 HOST_OS = $(shell uname -s | sed -e 's/Linux/linux/;s/Darwin/mac/')
 ifeq ($(HOST_OS), linux)
   TOOLCHAIN_DIR = linux-x86
 else
   ifeq ($(HOST_OS), mac)
     TOOLCHAIN_DIR = darwin-x86
   else
     $(error Host platform "${HOST_OS}" is not supported)
   endif
 endif
 
 ifeq ($(ARCH), android_arm)
   DEFINES  = target_arch=arm v8_target_arch=arm android_target_arch=arm
   DEFINES += arm_neon=0 armv7=1
   TOOLCHAIN_ARCH = arm-linux-androideabi-4.6
 else
-  ifeq ($(ARCH), android_mipsel)
-    DEFINES  = target_arch=mipsel v8_target_arch=mipsel android_target_arch=mips
-    DEFINES += mips_arch_variant=mips32r2
-    TOOLCHAIN_ARCH = mipsel-linux-android-4.6
+  ifeq ($(ARCH), android_a64)
+    DEFINES  = target_arch=a64 v8_target_arch=a64 android_target_arch=aarch64
+    TOOLCHAIN_ARCH = aarch64-linux-android-4.8
   else
-    ifeq ($(ARCH), android_ia32)
-      DEFINES = target_arch=ia32 v8_target_arch=ia32 android_target_arch=x86
-      TOOLCHAIN_ARCH = x86-4.6
+    ifeq ($(ARCH), android_mipsel)
+      DEFINES  = target_arch=mipsel v8_target_arch=mipsel
+      DEFINES += android_target_arch=mips mips_arch_variant=mips32r2
+      TOOLCHAIN_ARCH = mipsel-linux-android-4.6
     else
-      $(error Target architecture "${ARCH}" is not supported)
+      ifeq ($(ARCH), android_ia32)
+        DEFINES = target_arch=ia32 v8_target_arch=ia32 android_target_arch=x86
+        TOOLCHAIN_ARCH = x86-4.6
+      else
+        $(error Target architecture "${ARCH}" is not supported)
+      endif
     endif
   endif
 endif
 
 TOOLCHAIN_PATH = ${ANDROID_NDK_ROOT}/toolchains/${TOOLCHAIN_ARCH}/prebuilt
 ANDROID_TOOLCHAIN ?= ${TOOLCHAIN_PATH}/${TOOLCHAIN_DIR}
 ifeq ($(wildcard $(ANDROID_TOOLCHAIN)),)
   $(error Cannot find Android toolchain in "${ANDROID_TOOLCHAIN}")
 endif
 
@@ skipping 16 matching lines @@
 # Android GYP file generation targets.
 ANDROID_MAKEFILES = $(addprefix $(OUTDIR)/Makefile.,$(ANDROID_ARCHES))
 $(ANDROID_MAKEFILES):
         @GYP_GENERATORS=make-android \
         GYP_DEFINES="${DEFINES}" \
         CC="${ANDROID_TOOLCHAIN}/bin/*-gcc" \
         CXX="${ANDROID_TOOLCHAIN}/bin/*-g++" \
         build/gyp/gyp --generator-output="${OUTDIR}" build/all.gyp \
                       -Ibuild/standalone.gypi --depth=. -Ibuild/android.gypi \
                       -S.${ARCH} ${GYPFLAGS}