Add copyright notices

libraries/libavl/avl.c

 /* avl.c - routines to implement an avl tree */
+/*
+ * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
+ * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+ */
 /*
  * Copyright (c) 1993 Regents of the University of Michigan.
  * All rights reserved.

libraries/libldbm/ldbm.c

 /* ldbm.c - ldap dbm compatibility routines */
+/*
+ * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
+ * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+ */
 
 /* Patched for Berkeley DB version 2.0; /KSp; 98/02/23
  *

libraries/libldif/fetch.c

 /* line64.c - routines for dealing with the slapd line format */
+/*
+ * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
+ * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+ */
 
 #include "portable.h"
 

libraries/libldif/line64.c

 /* line64.c - routines for dealing with the slapd line format */
+/*
+ * Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
+ * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
+ */
 
 #include "portable.h"