Android NDK r21 Beta 2 (build 6011959)
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[NDK] Configure make

Follow the instructions in README.git to configure make. So that NDK can
build it.

Also add a README.android to record the upgrade process.

Bug: 133510638
Test: build
Change-Id: Iaad6711b3e514566f05bcae6da4b5886b7553a39
127 files changed