Add mosquitto and ffmpeg build shell script

guowenxue

2019-08-05 0c0505228fcc3fb726bbbd21cb4d42560b5a6560

tools/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi.tar.xz does not exist in tree 3ba158803fd63adafcecce0badb7f527a0b0d6a1