Revert "Remove a bunch of dead code"

This reverts commit 0d794f28f0.

I thought this was marked ACN. It wasn't.

src/core/async-getprop.c

@@ -407,7 +407,24 @@ async_get_property_handler (Display *dpy,
            * via the standard X mechanism, so don't do anything about
            * it, other than store it in task->error.
            */
-          task->error = BadImplementation;
+          {
+#if 0
+            xError error;
+#endif
+            
+            task->error = BadImplementation;
+
+#if 0
+            error.sequenceNumber = task->request_seq;
+            error.type = X_Error;
+            error.majorCode = X_GetProperty;
+            error.minorCode = 0;
+            error.errorCode = BadImplementation;
+
+            _XError (dpy, &error);
+#endif
+          }
+
           nbytes = netbytes = 0L;
           break;
         }