Jetson Nano transplant ncnn

compile & install

# a fresh start
$ sudo apt-get update
$ sudo apt-get upgrade
# install dependencies
$ sudo apt-get install cmake wget
$ sudo apt-get install libprotobuf-dev protobuf-compiler libvulkan-dev
# download ncnn
$ git clone --depth=1 https://github.com/Tencent/ncnn.git
# download glslang
$ cd ncnn
$ git submodule update --depth=1 --init
# prepare folders
$ mkdir build
$ cd build
# build 64-bit ncnn for Jetson Nano
$ cmake -DCMAKE_TOOLCHAIN_FILE=../toolchains/jetson.toolchain.cmake -DNCNN_VULKAN=ON -DCMAKE_BUILD_TYPE=Release ..
$ make -j4
$ sudo make install

test

$ cd ../benchmark
$ cp ../build/benchmark/benchncnn ./
$ ./benchncnn 8 4 0 -1 1
loop_count = 8
num_threads = 4
powersave = 0
gpu_device = -1
cooling_down = 1
          squeezenet  min =   30.36  max =   93.72  avg =   43.04
     squeezenet_int8  min =   32.96  max =   63.76  avg &#