aarch64上编译 ncnn

#下载包：
git clone https://github.com/Tencent/ncnn.git
git submodule update --init

unzip ncnn-master
cd ncnn-master

# 安装环境依赖项
sudo apt install build-essential cmake libprotobuf-dev protobuf-compiler libopencv-dev

# 编译方式1：使用CPU
mkdir -p build && cd build
cmake -D-DCMAKE_BUILD_TYPE=Release -DNCNN_VULKAN=OFF -DNCNN_BUILD_EXAMPLES=ON -DNCNN_PYTHON=OFF ..
make -j4
make install

# 编译方式2：使用Vulkan，编译python3.7
# install vulkan
sudo apt install libvulkan-dev libvulkan1 mesa-vulkan-drivers vulkan-utils

mkdir -p build-vulkan && cd build-vulkan
cmake -DCMAKE_BUILD_TYPE=Release -DNCNN_VULKAN=ON -DNCNN_BUILD_EXAMPLES=ON \
-DNCNN_PYTHON=ON -DPYTHON_EXECUTABLE=/usr/bin/python3.7 \
-DPYTHON_LIBRARY=/usr/lib/aarch64-linux-gnu/libpython3.7m.so ..
make -j4
make install