BUG#18881 valgrind: kernel memory leak in vm/Emulator.cpp

ndb/src/kernel/vm/Emulator.cpp:
  destroy theShutdownMutex in the destructor

ndb/src/kernel/vm/Emulator.cpp

@@ -106,6 +106,7 @@ EmulatorData::destroy(){
     delete theSimBlockList; theSimBlockList = 0;
   if(m_socket_server)
     delete m_socket_server; m_socket_server = 0;
+  NdbMutex_Destroy(theShutdownMutex);
   NdbMem_Destroy();
 }