Patch for openssh : allow to use AuthorizedKeysCommand on sshd on cygwin

[Pierre Souchay]

Hello,

Please consider this patch: 
https://github.com/pierresouchay/cygwin_patches/blob/master/openssh.patch

It patches opensshd to allow to use the AuthorizedKeysCommand on Cygwin 
(similar to https://github.com/openssh/openssh-portable/pull/72 )

Regards

Pierre Souchay