Fix unused_imports warning in no-std tests

Author: jkczyz

lightning/src/routing/gossip.rs

@@ -1935,6 +1935,7 @@ mod tests {
 	use crate::chain;
 	use crate::ln::channelmanager;
 	use crate::ln::chan_utils::make_funding_redeemscript;
+	#[cfg(feature = "std")]
 	use crate::ln::features::InitFeatures;
 	use crate::routing::gossip::{P2PGossipSync, NetworkGraph, NetworkUpdate, NodeAlias, MAX_EXCESS_BYTES_FOR_RELAY, NodeId, RoutingFees, ChannelUpdateInfo, ChannelInfo, NodeAnnouncementInfo, NodeInfo};
 	use crate::ln::msgs::{RoutingMessageHandler, UnsignedNodeAnnouncement, NodeAnnouncement,