Fix compile error on clang14.0.3 (#577)

Fixes #578

src/backend/BackendInterface.h

@@ -111,7 +111,7 @@ synchronous(F&& f)
      * R is the currently executing coroutine that is about to get passed.
      * If corountine types do not match, the current one's type is stored.
      */
-    using R = typename std::result_of<F(boost::asio::yield_context&)>::type;
+    using R = typename boost::result_of<F(boost::asio::yield_context&)>::type;
     if constexpr (!std::is_same<R, void>::value)
     {
         /**

src/rpc/RPC.cpp

@@ -178,7 +178,7 @@ public:
     {
         for (auto const& handler : handlers)
         {
-            handlerMap_[handler.method] = move(handler);
+            handlerMap_[handler.method] = std::move(handler);
         }
     }