Provide instructions for cross-compilation for ARM platform

I need clear instructions for how to cross-compile the cpuminer-multi[1] from x86_64 Ubuntu 14.04 to run on Lollipop (and later) Android platforms with ARM architecture.

The instructions should include but not limited to:

* Ubuntu packages to be installed

* instruction for toolchain installation

* any patches needed to configure and build cpuminer-multi for ARM platform

* how to specify supported CPU operations to optimize the executable for specific ARM variant

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안드로이드 리눅스 쉘 스크립트 우분투(Ubuntu)

프로젝트 ID: #15272052

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