build/make/Android.mk: support TARGET_ARCH_ABI=x86_64

requires r10e or newer:

Android NDK, Revision 10e (May 2015)
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Other bug fixes:
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  - Fixed .asm support for ABI x86_64.

Change-Id: I51ec9a5f77c982b7412d922e896348a83ae2d7d6
3 files changed