T99: [sftp] Add support for hardlink@openssh.com

Description

Originally reported by asn: https://bugs.libssh.org/T99

Add support for hardlink@openssh.com.

Comments:

Jakuje commented on 2018-10-09 12:49:53 UTC:

This landed in 6c56c1e0


asn commented on 2018-10-09 12:55:16 UTC:

We need it on client side.


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