ircd:Ⓜ️ Add missing/matching my(user).

include/ircd/m/user.h

@@ -15,6 +15,8 @@ namespace ircd::m
 {
 	struct user;
 
+	bool my(const user &);
+
 	bool exists(const id::user &);
 }
 

ircd/m/user.cc

@@ -54,6 +54,12 @@ ircd::m::exists(const user::id &user_id)
 	return user::users.has("ircd.user", user_id);
 }
 
+bool
+ircd::m::my(const user &user)
+{
+	return my(user.user_id);
+}
+
 /// Register the user by creating a room !@user:myhost and then setting a
 /// an `ircd.account` state event in the `users` room.
 ///