[Bug 2690] Add command line "ssh --version"

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2690

--- Comment #2 from jg at jguk.org ---
I appreciate that GNU long options aren't part of POSIX, but when they
are so common, is it not worth being GNU compatible now?

The other question, is could the usage be updated to include the
current version? eg

$ ssh
 OpenSSH_7.2p2 Ubuntu-4ubuntu2.1, OpenSSL 1.0.2g  1 Mar 2016
usage: ssh [-1246AaCfGgKkMNnqsTtVvXxYy] [-b bind_address] [-c
cipher_spec]
           [-D [bind_address:]port] [-E log_file] [-e escape_char] [-V]
           [-F configfile] [-I pkcs11] [-i identity_file] [-L address]
           [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p
port]
           [-Q query_option] [-R address] [-S ctl_path] [-W host:port]
           [-w local_tun[:remote_tun]] [user@]hostname [command]

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