Workaround tr1::functional bugs.

src/ripple_app/main/RPCHTTPServer.cpp

@@ -113,9 +113,13 @@ public:
         processSession (job, session);
 #else
         session.detach();
-        m_jobQueue.addJob (jtRPC, "RPC", bind (
-            &RPCHTTPServerImp::processSession, this, _1,
-                ref (session)));
+
+        // The "boost::"'s are a workaround for broken versions of tr1::functional that
+        // require the reference wrapper to be callable. HTTP::Session has abstract functions
+        // and so references to it are not callable.
+        m_jobQueue.addJob (jtRPC, "RPC", boost::bind (
+            &RPCHTTPServerImp::processSession, this, boost::_1,
+                boost::ref (session)));
 #endif
     }