$NetBSD: patch-ac,v 1.2 2013/08/30 16:53:45 joerg Exp $

Avoid compiler warning.

--- ripOLE/pldstr.c.orig	2008-10-31 16:17:32.000000000 +0000
+++ ripOLE/pldstr.c
@@ -237,8 +237,8 @@ int PLD_strncasecmp( char *s1, char *s2,
 
 	while(n > 0)
 	{
-		c1 = tolower(*ds1);
-		c2 = tolower(*ds2);
+		c1 = tolower((unsigned char)*ds1);
+		c2 = tolower((unsigned char)*ds2);
 
 		if (c1 == c2)
 		{