set CMAKE_SYSTEM_PROCESSOR in Linux #6872
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In our Linux toolchain, CMAKE_SYSTEM_NAME is set to Linux. But, according to here https://github.com/Kitware/CMake/blob/master/Modules/CMakeDetermineSystem.cmake#L108, CMAKE_SYSTEM_PROCESSOR will not be set so we will need to set it ourselves, so we will know our target architecture.