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Add support for building for the new 64 bit android ABIs

This requires the new NDK r10.

The mips64 ABI is handled by the default case, there's no need to
add custom code for that in platform-android.mk.

--- a/README.md

+++ b/README.md

@@ -69,8 +69,8 @@

 NDKLEVEL specifies android api level, the api level can be 12-19, the default is 12.

 By default these commands build for the armeabi-v7a ABI. To build for the other android

-ABIs, add "ARCH=mips" or "ARCH=x86". To build for the older armeabi ABI (which has

-armv5te as baseline), add "APP_ABI=armeabi" (ARCH=arm is implicit).

+ABIs, add "ARCH=arm64", "ARCH=x86", "ARCH=x86_64", "ARCH=mips" or "ARCH=mips64".

+To build for the older armeabi ABI (which has armv5te as baseline), add "APP_ABI=armeabi" (ARCH=arm is implicit).

 For iOS Builds

 --------------

--- a/build/platform-android.mk

+++ b/build/platform-android.mk

@@ -12,10 +12,17 @@

   ifeq (Yes, $(USE_ASM))

     ASMFLAGS += -march=armv7-a -mfpu=neon

   endif

+else ifeq ($(ARCH), arm64)

+  APP_ABI = arm64-v8a

 else ifeq ($(ARCH), x86)

     APP_ABI = x86

   ifeq (Yes, $(USE_ASM))

     ASMFLAGS += -f elf32

+  endif

+else ifeq ($(ARCH), x86_64)

+  APP_ABI = x86_64

+  ifeq (Yes, $(USE_ASM))

+    ASMFLAGS += -f elf64

   endif

 else

     APP_ABI = $(ARCH)