'hiding test from rootcore' (TrigSteeringEvent-01-06-19)

	* test/StringSerializer_test.cxx : hide from rootcore
	* Tagging TrigSteeringEvent-01-06-19


Former-commit-id: e4e0fc261f19e8a1744f87ad844945da87a50aa7

Trigger/TrigEvent/TrigSteeringEvent/test/StringSerializer_test.cxx

@@ -8,6 +8,15 @@
  * See the requirements file on how to compile/run this.
  */
 
+//not working for rootcore
+#ifdef XAOD_STANDALONE
+int main() {
+  return 0;
+}
+#endif
+
+#ifndef XAOD_STANDALONE
+
 #include "TrigSteeringEvent/StringSerializer.h"
 
 #include <string>
@@ -112,4 +121,4 @@ int main() {
   }  
 }
 
-
+#endif //no rootcore