Don't choke on disabled authorized_keys(5) options

As of 2020.79 X11 forwarding is disabled at build time, which could lock
out users with authorized_keys(5) files containing ‘no-X11-forwarding’
options.

svr-authpubkeyoptions.c

@@ -147,20 +147,20 @@ int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filena
 			ses.authstate.pubkey_options->no_port_forwarding_flag = 1;
 			goto next_option;
 		}
-#if DROPBEAR_SVR_AGENTFWD
 		if (match_option(options_buf, "no-agent-forwarding") == DROPBEAR_SUCCESS) {
+#if DROPBEAR_SVR_AGENTFWD
 			dropbear_log(LOG_WARNING, "Agent forwarding disabled.");
 			ses.authstate.pubkey_options->no_agent_forwarding_flag = 1;
+#endif
 			goto next_option;
 		}
-#endif
-#if DROPBEAR_X11FWD
 		if (match_option(options_buf, "no-X11-forwarding") == DROPBEAR_SUCCESS) {
+#if DROPBEAR_X11FWD
 			dropbear_log(LOG_WARNING, "X11 forwarding disabled.");
 			ses.authstate.pubkey_options->no_x11_forwarding_flag = 1;
+#endif
 			goto next_option;
 		}
-#endif
 		if (match_option(options_buf, "no-pty") == DROPBEAR_SUCCESS) {
 			dropbear_log(LOG_WARNING, "Pty allocation disabled.");
 			ses.authstate.pubkey_options->no_pty_flag = 1;