UI: Log compiled & runtime Qt versions

UI/obs-app.cpp

@@ -1456,6 +1456,8 @@ bool OBSApp::OBSInit()
 	     browserHWAccel ? "true" : "false");
 #endif
 
+	blog(LOG_INFO, "Qt Version: %s (runtime), %s (compiled)", qVersion(),
+	     QT_VERSION_STR);
 	blog(LOG_INFO, "Portable mode: %s", portable_mode ? "true" : "false");
 
 	setQuitOnLastWindowClosed(false);