win10 编译ncnn

1.均需要安装cmake 2. download protobuf-3.4.0 from https://github.com/google/protobuf/archive/v3.4.0.zip 如果你是vs2015: 3.cd <protobuf-root-dir>  4.mkdir build-vs2015 5.cd build-vs2015   5.1：   "c:\Program Fil

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