(get_real_username): Added a const qualifier to the return value.

src/server/rfc931.h

 /*
- * $Id: rfc931.h,v 1.5 1995/01/01 20:17:27 ceder Exp $
+ * $Id: rfc931.h,v 1.6 1998/07/08 17:01:38 ceder Exp $
  * Copyright (C) 1991, 1992, 1994, 1995  Lysator Academic Computer Association.
  *
  * This file is part of the LysKOM server.
@@ -23,5 +23,4 @@
  * Please mail bug reports to bug-lyskom@lysator.liu.se. 
  */
 
-char *get_real_username(IscSession *scb,
-			char *hostname);
+const char *get_real_username(IscSession *scb, char *hostname);