(CMOD_C_ATTRIBUTE_UNUSED): Use all three arguments of AC_DEFINE.

acinclude.m4

-dnl $Id: acinclude.m4,v 1.5 2001/09/30 16:52:08 ceder Exp $
+dnl $Id: acinclude.m4,v 1.6 2002/06/13 22:48:03 ceder Exp $
 dnl Copyright (C) 1994-1995, 1998-1999, 2001  Lysator Academic Computer Association.
 dnl
 dnl This file is part of the LysKOM server.
@@ -52,5 +52,6 @@ AC_CACHE_VAL([cmod_cv_c_attribute_unused_understood],
 	[cmod_cv_c_attribute_unused_understood=no]))
 AC_MSG_RESULT($cmod_cv_c_attribute_unused_understood)
 [if test $cmod_cv_c_attribute_unused_understood = yes ; then]
-    AC_DEFINE(HAVE_ATTRIBUTE_UNUSED)
+    AC_DEFINE([HAVE_ATTRIBUTE_UNUSED], 1, 
+	      [Define if your compiler supports __attribute__ ((unused)).])
 [fi]])dnl