options: The new option SSH_OPTIONS_PUBLICKEY_ACCEPTED_TYPES

This option allows to specify acceptable public key algorithms
and reflects the PubkeyAcceptedTypes configuration option from
OpenSSH.

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit 4521ab73b6)

include/libssh/libssh.h

@@ -404,6 +404,7 @@ enum ssh_options_e {
   SSH_OPTIONS_GSSAPI_AUTH,
   SSH_OPTIONS_GLOBAL_KNOWNHOSTS,
   SSH_OPTIONS_NODELAY,
+  SSH_OPTIONS_PUBLICKEY_ACCEPTED_TYPES,
 };
 
 enum {

include/libssh/session.h

@@ -204,6 +204,7 @@ struct ssh_session_struct {
         char *knownhosts;
         char *global_knownhosts;
         char *wanted_methods[10];
+        char *pubkey_accepted_types;
         char *ProxyCommand;
         char *custombanner;
         unsigned long timeout; /* seconds */