windows ssh and git server

* [[https://gist.github.com/samhocevar/00eec26d9e9988d080ac]]
to start shell as mingw64/mingw32:
  1. set PermitUserEnvironment to yes in /etc/ssh/sshd_config
  2. add MSYSTEM=MINGW64 to ~/.ssh/environment
  3. /usr/bin/sshd to start ssh server, to access it using local user name and password
clone git by ssh:
git clone ssh://zhengxd@192.168.1.4/d/workdir/algorithmProject/solvespace-git
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