Don't check for SSL_OP_CISCO_ANYCONNECT

We don't use it with OpenSSL 1.1 and in some builds it might not be present.

And nobody in their right mind would ever care about an OpenSSL build so
old that it doesn't have it (i.e. before 0.9.8k).

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

openconnect-internal.h

@@ -649,8 +649,7 @@ struct openconnect_info {
 #define read_fd_monitored(_v, _n) FD_ISSET(_v->_n##_fd, &_v->_select_rfds)
 #endif
 
-#if (defined(DTLS_OPENSSL) && defined(SSL_OP_CISCO_ANYCONNECT)) || \
-	defined(DTLS_GNUTLS))
+#if defined(DTLS_OPENSSL) || defined(DTLS_GNUTLS)
 #define HAVE_DTLS 1
 #endif