If both Putty and OpenSSH agents are running, only the Putty agent is used

[MarcelInTO]

On Windows 10, I have my system configured to use the OpenSSH agent that comes with windows and libssh2 works as expected. At some point I installed an application that started up a Putty Agent which was not configured with any keys. At that point, the applications that rely on libssh2 stopped working.

Looking through the code, it appears that if a Putty Agent is found, libssh2 will not check against a running OpenSSH agent.

To Reproduce

1. Configure Windows system to work with an openssh ssh-agent and configure that agent with a key
2. Test successfully against a server using that key
3. Start a Putty agent.
4. Test again that same server and it will fail.

Expected behavior
If both Putty and OpenSSH agents are running, both are checked for keys so that neither takes priority over the other.

[stale]

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