update ds18b20 source code

Guo Wenxue

2022-09-21 93fb646dc67d6339e75a6787d629bbe3c45b9b37

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