agent: Fix binary vs. text mode problem in ssh.
* agent/command-ssh.c (file_to_buffer) (ssh_handler_request_identities): Open streams in binary mode. (start_command_handler_ssh): Factor some code out to .. (setup_ssh_env): new function.
This is for now a theoretical fix because there is no ssh client yet
which uses the GnuPG style IPC. OpenSSL for Cygwin uses only a quite
similar one. gniibe suggested to implement that IPC style in
Libassuan so that a Cygwin version of OpenSSL may be used with GnuPG.
- Signed-off-by: Werner Koch <wk@gnupg.org>