Fix intrusive_ptr template init on windows. The second template argum…

…ent should probably be removed if its not neccesary for other platforms. I did not find boost documentation for what the second argument actually does, but in the meanwhile ifdeffed so that builds on windows (yes its ugly). Fixes XRPLF#198 (with a semi hack).

websocketpp/endpoint.hpp

@@ -304,7 +304,14 @@ class endpoint : public config::transport_type, public config::endpoint_base {
      */
     connection_ptr get_con_from_hdl(connection_hdl hdl, lib::error_code & ec) {
         scoped_lock_type lock(m_mutex);
+/** @todo This wont build on windows with null as the second template argument.
+    I tried to look at the boost docs for this and cound not find why the second param is here.
+    Cleanup ifdefs when verified this builds on other systems. */
+#ifdef WIN32
+        connection_ptr con = lib::static_pointer_cast<connection_type>(
+#else
         connection_ptr con = lib::static_pointer_cast<connection_type,void>(
+#endif
             hdl.lock());
         if (!con) {
             ec = error::make_error_code(error::bad_connection);