Try to create messages at install time.

If the service was never run under a privileged account we might not
have been able to set the message source in the registry.

Set the message source when installing the service, as we are guaranteed
to have the necessary rights.

nssm.cpp

@@ -146,6 +146,7 @@ int _tmain(int argc, TCHAR **argv) {
     if (str_equiv(argv[1], _T("rotate"))) exit(control_service(NSSM_SERVICE_CONTROL_ROTATE, argc - 2, argv + 2));
     if (str_equiv(argv[1], _T("install"))) {
       if (! is_admin) exit(elevate(argc, argv, NSSM_MESSAGE_NOT_ADMINISTRATOR_CANNOT_INSTALL));
+      create_messages();
       exit(pre_install_service(argc - 2, argv + 2));
     }
     if (str_equiv(argv[1], _T("edit")) || str_equiv(argv[1], _T("get")) || str_equiv(argv[1], _T("set")) || str_equiv(argv[1], _T("reset")) || str_equiv(argv[1], _T("unset"))) {