update iotd 3rdlib build shell script for cjson

guowenxue

2021-05-02 aed475c7a57e329a3e90cce56d00ca997f519cda

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