update socket_server.c, fix Address already in use bug, setsockopt must p...

Guo Wenxue

2018-10-24 357fe7ceed7c2cf00cbe1b26e19cd2b9fde51aab

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Install cross compiler to /opt path:
 
sudo tar -xjf rpi_crosstool.tar.bz2 -C /opt/