Added Copyright notice.

src/libraries/libansi/difftime.c

+/*
+ * $Id: difftime.c,v 1.3 1994/03/06 19:41:33 ceder Exp $
+ * Copyright (C) 1993, 1994  Lysator Academic Computer Association.
+ *
+ * This file is part of the LysKOM server.
+ * 
+ * LysKOM is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by 
+ * the Free Software Foundation; either version 1, or (at your option) 
+ * any later version.
+ * 
+ * LysKOM is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with LysKOM; see the file COPYING.  If not, write to
+ * Lysator, c/o ISY, Linkoping University, S-581 83 Linkoping, SWEDEN,
+ * or the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, 
+ * MA 02139, USA.
+ *
+ * Please mail bug reports to bug-lyskom@lysator.liu.se. 
+ */
+
+static char *rcsid = "$Id: difftime.c,v 1.3 1994/03/06 19:41:33 ceder Exp $";
+#include "rcs.h"
+USE(rcsid);
+
 #include <time.h>
 #include <sys/types.h>		/* Needed for time_t on dynix.*/
 #include "tmp-difftime.h"