Forward ssh-agent data between ssh clients and RDP

Add xrdp-ssh-agent.c which forwards ssh-agent protocol over an RDP
dynamic virtual channel, just as the normal ssh-agent forwards it over
an SSH channel.

Usage:

Run an RDP client with the corresponding plugin enabled; for example
"xfreerdp /ssh-agent ...".

In the remote desktop session run xrdp-ssh-agent and evaluate the output
in the shell as for ssh-agent to set the required environment variables
(specifically $SSH_AUTH_SOCK):

   eval "$(xrdp-ssh-agent -s)"

This is the same as for the normal ssh-agent.  You would typically do
this in your Xsession or /etc/xrdp/startwm.sh.

Limitations:

1. Error checking and handling could be improved.

2. This stays running when the xrdp session closes.  This should be
fixed using a command line argument as for the real ssh-agent.

3. This is only tested on Linux and will only work on systems where
clients talk to the ssh-agent via Unix domain sockets.  It won't
currently work on Windows but it could be ported.

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