common: support opt_shutdown_anysegwit checks (EXPERIMENTAL_FEATURES).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/lightningd.c

@@ -809,6 +809,7 @@ static struct feature_set *default_features(const tal_t *ctx)
 #if EXPERIMENTAL_FEATURES
 		OPTIONAL_FEATURE(OPT_ANCHOR_OUTPUTS),
 		OPTIONAL_FEATURE(OPT_ONION_MESSAGES),
+		OPTIONAL_FEATURE(OPT_SHUTDOWN_ANYSEGWIT),
 #endif
 	};