GH1446: Add SSL_SESSION_get0_cipher

=pod

=head1 NAME

SSL_SESSION_get0_cipher - retrieve the SSL cipher associated with a session

=head1 SYNOPSIS

 #include <openssl/ssl.h>

 const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSSION *s);

=head1 DESCRIPTION

SSL_SESSION_get0_cipher() retrieves the cipher that was used by the

connection when the session was created, or NULL if it cannot be determined.

The value returned is a pointer to an object maintained within B<s> and

should not be released.

=head1 SEE ALSO

L<ssl(3)>,

L<d2i_SSL_SESSION(3)>,

L<SSL_SESSION_get_time(3)>,

L<SSL_SESSION_get0_hostname(3)>,

L<SSL_SESSION_free(3)>

=head1 HISTORY

SSL_SESSION_get0_cipher() was first added to OpenSSL 1.1.0

=head1 COPYRIGHT

Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License").  You may not use

this file except in compliance with the License.  You can obtain a copy

in the file LICENSE in the source distribution or at

L<https://www.openssl.org/source/license.html>.

=cut

__owur long SSL_SESSION_set_timeout(SSL_SESSION *s, long t);

__owur int SSL_SESSION_get_protocol_version(const SSL_SESSION *s);

__owur const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s);

__owur const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSION *s);

__owur int SSL_SESSION_has_ticket(const SSL_SESSION *s);

__owur unsigned long SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *s);

void SSL_SESSION_get0_ticket(const SSL_SESSION *s, unsigned char **tick,

    return s->ssl_version;

}

const SSL_CIPHER *SSL_SESSION_get0_cipher(const SSL_SESSION *s)

{

    return s->cipher;

}

const char *SSL_SESSION_get0_hostname(const SSL_SESSION *s)

{

    return s->tlsext_hostname;

SSL_dane_set_flags                      401	1_1_0	EXIST::FUNCTION:

SSL_CTX_dane_clear_flags                402	1_1_0	EXIST::FUNCTION:

SSL_dane_clear_flags                    403	1_1_0	EXIST::FUNCTION:

SSL_SESSION_get0_cipher                 404	1_1_0	EXIST::FUNCTION: