update setup_systools shell script

Guo Wenxue

2022-04-09 cccd7a63a3e627e579fd26f289391f1c3a9f0c11

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