itroduce ADL via algorithm specific ch, corech and mld namespaces

include/engine/routing_algorithms/many_to_many.hpp

@@ -13,16 +13,18 @@ namespace osrm
 {
 namespace engine
 {
-
 namespace routing_algorithms
 {
 
+namespace ch
+{
 std::vector<EdgeWeight>
 manyToManySearch(SearchEngineData &engine_working_data,
-                 const datafacade::ContiguousInternalMemoryDataFacade<algorithm::CH> &facade,
+                 const datafacade::ContiguousInternalMemoryDataFacade<Algorithm> &facade,
                  const std::vector<PhantomNode> &phantom_nodes,
                  const std::vector<std::size_t> &source_indices,
                  const std::vector<std::size_t> &target_indices);
+} // namespace ch
 
 } // namespace routing_algorithms
 } // namespace engine