Support compiling under ARM64 environment using gcc #349
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在Ubuntu:20.04 aarch64环境下使用cmake .. && make编译出错（gcc版本9.3.0）,原因是sse4是gcc x86选项，在arm64上的gcc并不支持。所以在CMakeLists.txt加上cpu类型检查，在不是intel cpu的情况下不加sse4选项。
错误信息：
c++: error: unrecognized command line option '-msse4'
c++: error: unrecognized command line option '-msse4.2'