Bug#1079246: RE: gcr4: Environment variable SSH_AUTH_SOCK is hijacked by gcr-ssh-agent

[Ian Abbott]

The main use case for gpg-ssh-agent is to use authentication subkeys in 
OpenPGP keys as SSH keys, but I do not think gcr-ssh-agent currently 
supports that functionality.  (Perhaps it might do so in a future 
version?)  So it is unfortunate that gcr-ssh-agent.socket hijacks the 
SSH_AUTH_SOCK environment variable set by gpg-ssh-agent.socket.