Added comment about hacky log line #4690

@XinyuHou, when adding hacks, please annotate with a comment

src/lib/synergy/ToolApp.cpp

@@ -63,6 +63,7 @@ ToolApp::run(int argc, char** argv)
 				return kExitFailed;
 			}
 			else {
+				// HACK: send to standard out so watchdog can parse.
 				std::cout << "activeDesktop:" << name.c_str() << std::endl;
 			}
 #endif