agent,w32: Support Win32-OpenSSH emulation by gpg-agent.
* agent/agent.h (start_command_handler_ssh_stream): New. * agent/command-ssh.c (start_command_handler_ssh_stream): New. * agent/gpg-agent.c (oWin32OpenSSHSupport): New. (W32_DEFAILT_AGENT_PIPE_NAME): New. (main): Add oWin32OpenSSHSupport support. (win32_openssh_thread): New. (handle_connections): Spawn win32_openssh_thread. * configure.ac (NEED_GPGRT_VERSION): Require libgpg-error 1.46.
- GnuPG-bug-id: T3883
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>