update iotd, test MQTT subscriber ok

guowenxue

2021-04-21 af30c84d820576c37e57de31bc47d18b6e4b89e1

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all:
    sed -i -e "s|^CROSSTOOL=.*|CROSSTOOL=${CROSSTOOL}|g" build.sh
    @bash build.sh
 
distclean: 
    @bash build.sh clean