Fix build error after merging with develop branch

Test cmd:
curl --data '{"method": "call", "params": ["database", "get_random_number", [1000]], "jsonrpc": "2.0", "id": 1}' http://127.0.0.1:8090/ws
curl --data '{"method": "call", "params": ["database", "get_random_number", [5000]], "jsonrpc": "2.0", "id": 1}' http://127.0.0.1:8090/ws
curl --data '{"method": "call", "params": ["database", "get_random_number", [1000000]], "jsonrpc": "2.0", "id": 1}' http://127.0.0.1:8090/ws

libraries/app/database_api.cpp

@@ -173,6 +173,8 @@ class database_api_impl : public std::enable_shared_from_this<database_api_impl>
       vector<tournament_object> get_tournaments_by_state(tournament_id_type stop, unsigned limit, tournament_id_type start, tournament_state state);
       vector<tournament_id_type> get_registered_tournaments(account_id_type account_filter, uint32_t limit) const;
 
+      // rng
+      int64_t get_random_number(uint64_t bound) const;
 
    //private:
       template<typename T>
@@ -2128,6 +2130,22 @@ vector<tournament_id_type> database_api_impl::get_registered_tournaments(account
    return tournament_ids;
 }
 
+//////////////////////////////////////////////////////////////////////
+//                                                                  //
+// Random numbers                                                   //
+//                                                                  //
+//////////////////////////////////////////////////////////////////////
+
+int64_t database_api::get_random_number(uint64_t bound) const
+{
+   return my->get_random_number(bound);
+}
+
+int64_t database_api_impl::get_random_number(uint64_t bound) const {
+    int64_t result = _db.get_random_bits(bound);
+    return result;
+}
+
 //////////////////////////////////////////////////////////////////////
 //                                                                  //
 // Private methods                                                  //

libraries/app/include/graphene/app/database_api.hpp

@@ -667,7 +667,16 @@ class database_api
        */
       vector<tournament_id_type> get_registered_tournaments(account_id_type account_filter, uint32_t limit) const;
 
-   private:
+      //////////
+      // RNG //
+      //////////
+      /**
+       * @return Current Random number
+       */
+      int64_t get_random_number(uint64_t bound) const;
+
+
+private:
       std::shared_ptr< database_api_impl > my;
 };
 
@@ -794,4 +803,7 @@ FC_API(graphene::app::database_api,
    (get_tournaments_by_state)
    (get_tournaments )
    (get_registered_tournaments)
+
+   // rngs
+   (get_random_number)
 )