code refactoring

modules/os_interface/os_interface.h

@@ -1,3 +1,5 @@
+#ifndef _OS_INTERFACE_H
+#define _OS_INTERFACE_H
 /*
  * JTAG Boundary Scanner
  * Copyright (c) 2008 - 2024 Viveris Technologies
@@ -116,3 +118,5 @@ int network_close(void * network_connection);
 #ifdef __cplusplus
 }
 #endif
+
+#endif