加载golang.org/x/*包超时问题

从github上面拉取golang包，做一个软连映射即可；

git clone https://github.com/golang/net.git $GOPATH/src/github.com/golang/net
git clone https://github.com/golang/sys.git $GOPATH/src/github.com/golang/sys
ln -s /data/www/golang/src/github.com/golang /data/www/golang/src/golang.org/x