common/features: add option_support_large_channel.

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

common/features.c

@@ -52,6 +52,10 @@ static const struct feature_style feature_styles[] = {
 	  .copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
 			  [NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT,
 			  [BOLT11_FEATURE] = FEATURE_REPRESENT } },
+	{ OPT_LARGE_CHANNELS,
+	  .copy_style = { [INIT_FEATURE] = FEATURE_REPRESENT,
+			  [NODE_ANNOUNCE_FEATURE] = FEATURE_REPRESENT,
+			  [CHANNEL_FEATURE] = FEATURE_REPRESENT_AS_OPTIONAL } },
 };
 
 static enum feature_copy_style feature_copy_style(u32 f, enum feature_place p)

common/features.h

@@ -92,8 +92,10 @@ u8 *featurebits_or(const tal_t *ctx, const u8 *f1 TAKES, const u8 *f2 TAKES);
  *
  * | 14/15 | `payment_secret` |... IN9 ...
  * | 16/17 | `basic_mpp`      |... IN9 ...
+ * | 18/19 | `option_support_large_channel` |... INC+ ...
  */
 #define OPT_PAYMENT_SECRET			14
 #define OPT_BASIC_MPP				16
+#define OPT_LARGE_CHANNELS			18
 
 #endif /* LIGHTNING_COMMON_FEATURES_H */