$NetBSD: patch-configure,v 1.1 2025/07/16 09:58:42 jperkin Exp $

Fix configure test.

--- configure.orig	2025-07-16 09:49:19.556194002 +0000
+++ configure
@@ -5004,6 +5004,7 @@ cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
 #include <ctype.h>
+#include <stdlib.h>
 #if ((' ' & 0x0FF) == 0x020)
 # define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
 # define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))