Use OBS_HAVECONFIG_H for version string

obs/obs-app.cpp

@@ -210,9 +210,11 @@ string OBSApp::GetVersionString() const
 		LIBOBS_API_MINOR_VER << "." <<
 		LIBOBS_API_PATCH_VER;
 
-#ifndef _WIN32
+#ifdef HAVE_OBSCONFIG_H
 	ver << " (" << OBS_VERSION << ")";
-#else
+#endif
+
+#ifdef _WIN32
 	if (sizeof(void*) == 8)
 		ver << " (64bit)";
 	else