Add copyright notice (to generate log message).

build/mkdep

 #!/bin/sh -
+# Copyright 1998,1999 The OpenLDAP Foundation
+# COPYING RESTRICTIONS APPLY.  See COPYRIGHT File in top level directory
+# of this package for details.
 #
+# Portions
 # Copyright (c) 1987 Regents of the University of California.
 # All rights reserved.
 #