Make as_directed_to non-public

...as the bindings generation does not currently have the ability
to map a reference to a `NodeId` inside a tuple.

Author: TheBlueMatt

lightning/src/routing/gossip.rs

@@ -1056,7 +1056,7 @@ impl PartialEq for ChannelInfo {
 impl ChannelInfo {
 	/// Returns a [`DirectedChannelInfo`] for the channel directed to the given `target` from a
 	/// returned `source`, or `None` if `target` is not one of the channel's counterparties.
-	pub fn as_directed_to(&self, target: &NodeId) -> Option<(DirectedChannelInfo<'_>, &NodeId)> {
+	pub(crate) fn as_directed_to(&self, target: &NodeId) -> Option<(DirectedChannelInfo<'_>, &NodeId)> {
 		if self.one_to_two.is_none() || self.two_to_one.is_none() {
 			return None;
 		}