merge of Simon's latest patch
void ssh_gssapi_supported_oids(gss_OID_set *oidset);
enum ssh_gss_id ssh_gssapi_get_ctype(Gssctxt *ctxt);
-OM_uint32 ssh_gssapi_import_name(Gssctxt *ctx, char *host);
+OM_uint32 ssh_gssapi_import_name(Gssctxt *ctx, const char *host);
OM_uint32 ssh_gssapi_acquire_cred(Gssctxt *ctx);
OM_uint32 ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds,
gss_buffer_desc *recv_tok,