update client and socket.c, add DNS support

GuoWenxue

2022-04-19 ea435789dc2fab30ec16fa765a0b6577fe08166a

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all:
    cd sqlite && ./build.sh
    cd cjson && ./build.sh
 
clean:
    cd sqlite && rm -rf sqlite*
    cd cjson && rm -rf c*
 
distclean: clean
    rm -rf install